It is commonly believed that Vader recieved a less advanced, uncomfortable suit from Palpatine on purpose, to keep him in controll more easily while also bolstering his pain and anger.
Sidious created the suit to keep his apprentice alive, but he also intended to ensure Vader remained loyal to him. Acting primarily as a life support system, Vader's suit keeps him alive, but Sidious ensured it also kept him in pain. Vader constantly experiences excruciating pain due to the suit's design.
However, the transfer into the suit would have been agonizingly painful. To Vader, there would be little point in doing so, especially considering there remained the possibility he'd not survive the procedure. On top of that, Palpatine designed the suit to be painful to Vader.
Even though Palpatine's kindness towards Anakin was always fake, he still had respect for Anakin's power. But now that Anakin is beaten and scarred, Palpatine has lost all respect for him. Up to Star Wars: Episode VI - Return of the Jedi, Palpatine treats Vader poorly, and they very much have an abusive relationship.
Many years later he nearly defeated Vader because he had installed a kill-switch in the suit, so that he could leave Vader crippled by deactivating his cybernetic armor.
If Vader was able to access his full potential and immerse himself completely in the force, he would have no trouble overthrowing Palpatine... So for that reason, Vader's suit kept him in a constant state of weakness, but also brought his his full range of anger and pain.
Secondly, the suit itself was a reminder. to Vader of all the evil things he had done, as well as keeping him in near constant agony, deepening his connection to the Dark Side. By upgrading his suit, Vader would have likely. become a far more powerful Jewelist, but he would have lost a large part of what made Vader.
In Star Wars: Episode III - Revenge of the Sith, Darth Vader slaughtered Younglings to cement his position as Palpatine's apprentice - but he was still haunted by this after The Empire Strikes Back.
It was for that love that Vader killed Palpatine, but according to Darth Sidious himself, it was a "pathetic display" and "all for nothing," because in the end, Darth Vader sacrificed his own life yet "the Sith would return."
Emperor Palpatine viewed Darth Vader as a disappointment, and yet he let him live.
Given the physical and psychological trauma he had gone through since Star Wars: Episode III - Revenge of the Sith, Darth Vader wasn't confident enough that he can succeed if he antagonized Emperor Palpatine.
Weakness: Electricity
It took a single-minded desire to inflict pain upon another individual to transform the Force into such a destructive weapon. Darth Vader possessed the skill to use Force lightning, but the limitations of his suit prevented this.
Palpatine proceeds to almost entirely exterminate the Jedi through Order 66 and manipulate Jedi Knight Anakin Skywalker into becoming his new apprentice, Darth Vader. He transforms the Galactic Republic into the Empire and declares himself Emperor, using Machiavellian manipulation to invoke martial law.
He can only breathe without the need for his mask when he is in one of his meditation chambers seen in The Empire Strikes Back.
Darth Vader's Suit Embeds Needles In His Skin
Unfortunately, these needles, which transmit neurological data throughout his body and allow him to control his limbs, also cause him constant pain. Between the never-ending itchiness and walking around with needles in his skin, it's no wonder he is so angry.
Darth Vader's armor, also known as Darth Vader's suit, was a suit of armor worn by the cyborg Sith Lord Darth Vader. Designed with life support technology, the armor ensured Vader's survival following the lightsaber and burn injuries that he sustained in a duel with Jedi Master Obi-Wan Kenobi on Mustafar.
The Emperor wanted Vader to bring Skywalker before him, so he could be turned to the dark side. Despite Vader's seeming loyalty to the Emperor, Palpatine wanted to replace his servant with a new apprentice, while Vader plotted to overthrow the Emperor so he could rule the galaxy with his son.
A Sith Lord with the ability to cheat death and create life, Plagueis is the mentor of Sheev Palpatine / Darth Sidious, who, in accordance to the Sith's Rule of Two, eventually betrays Plagueis by murdering him in his sleep, taking his place as Sith Master.
Star Wars creator George Lucas has stated that the reason Palpatine couldn't anticipate Vader's betrayal in Return of the Jedi was that he can't truly understand the concept of love.
Giving in to his feelings, Anakin cuts off Mace Windu's hand, giving Palpatine the opportunity to kill him. Anakin regrets this almost instantly, but the thought of Padme was stronger than his remorse This is the moment Anakin officially became Darth Vader and led to serious issues in the Skywalker Saga.
Yes, his entire character since then was a self loathing tragic monster who has little reason to care about anything. Betraying Mace Windu instantly made him regret his act of impulse, Padme's death and rejection of his actions later on made it stick.
The short answer is yes, without a doubt, Vader regretted becoming a cybernetic monstrosity. First, there's the constant pain and discomfort from his suit. Worse, however, is the psychological pain. Vader destroyed everything he had ever known for a chance to save Padme.
15 He Can't Sleep
Truth is, he was constantly uncomfortable whenever he was in his suit, to the point that it made him sometimes incredibly insane. Vader needed to take breaks, dipping himself in a liquid chamber where he allowed himself to meditate as we saw in a deleted scene of Rogue One.
Vader's suit can help to regulate bodily temperature just as the human body can. The armor gets hot and sweaty, but its sensitive temperature regulation system controlled by a function box on the belt take care of that problem.