Do you find hypnosis or the mind control device more useful?

Personally I find regular hypnosis much better because it seems to work more often and doesn't tire you out as much but maybe I'm using the device wrong.

The device can also be sold for some sweet early cash as well.

I find the MCD is good in the early game when my goal is just to raise Hypnosis skills at every opportunity. It can't be used in groups so I pull it out when I catch someone isolated somewhere and don't want to risk a failure while my own skill is low

I don't know if anything even happens if you sell it, but I'm a paranoid MFer so I didn't trust him with it lol

I don't recall selling it being for anything but cash. To the best of my recollection, the MCD is equivalent to a mid-low skill level, and also returns much lower skill increase compared to the skill usage, so I tend to avoid it as much as possible, saving it for "Really must succeed" moments... Which works out to be "never" in my own playthroughs; I should just sell it.

It might be nice if it could be used for auto-success of mainline quest-hypno events (if this isn't already the case, and only when no other options exist, e.g., Titsbig chain "counselling") so that you could just not bother with grinding hypno at all, without locking out mainline quests. In this idea, perhaps it wouldn't be sellable until you ground your actual hypno up to the level needed to pass those quests, so you couldn't actually lock yourself out.

The Kenshuck mod pack has a couple events tied to the MCD.

Otherwise I use it primarily for early-game bootstrapping the stats of non-quest PTA/staff. Stacy Slutsky, in particular, starts with 90 willpower and you need to knock that down a bit before she becomes reliably vulnerable to normal hypno (which you want for the club expansions).