system
Given the following post, respond as if you're commenting on Reddit:
human
[Spoilers][Star Wars] In canon, is Darth Vader still in constant pain?

Before canon it was stated in "Legends". That he was in constant pain, the suit was uncomfortable and purposefully so, since Palpatine never wanted Vader to reach his full potential.

But now that it's no longer canon, and in R1 Darth Vader now has a castle, and inside of this castle he has his own cozy bacta tank, so does this mean his suit is still painful to wear? Or is it just to have a moment of bliss?
gpt
Yes,  see the novel Lords of the Sith: 

"Vader completed his meditation and opened his eyes. His pale, flame-savaged face stared back at him from out of the reflective black transparisteel of his pressurized meditation chamber. Without the neural connection to his armor, he was conscious of the stumps of his legs, the ruin of his arms, the perpetual pain in his flesh. He welcomed it. Pain fed his hate, and hate fed his strength. Once, as a Jedi, he had meditated to find peace. Now he meditated to sharpen the edges of his anger"