I think the chillstabs are mostly a character beat for the Angel. Do they have their pacients take painkillers after pain, or are the "bite on this" kind?
As for the player suffering the harm being healed, well, it depends on how much you make the pain matter in the game - in default AW, that's not much, but then AW is very customizable.
In a game I ran once, I trust the players would not have minded getting some chillstabs. The city was full of jerks, the characters kept getting in trouble and hurt, and the only local medic-type-guy charged an arm and a leg to basically brutalize them with weird machinery. One of the guys got shotgun shrapnel ripped out of him with an electromagnet, another one failed to make full payment and covered the rest by granting the guy rights to experiment on him, a third one had a kidney cut out during trauma surgery, again as part of payment.
When the default healing process is basically a kind of mutilation, I would think spending a week blissed out on chillstabs becomes far more attractive.