It is worth pointing out here that Stim Dealer is NOT unique. If you have two installed, you can get 6 click turns! ...followed by 2 brain damage. All three installed at once means you can get a whopping 7 clicks!...followed by losing half your hand.
Is this useful? Maybe. I've seen it work in a Data Leak Reversal deck to deck out the corp. 5, 6, or 7 cards trashed form the top of R&D per turn is VERY powerful. Make sure you pack ways to deal with the brain damage, or all the clicks in the world won't save you from death. Also, when installing multiples, how you sync them up matters. Would you rather spread out the brain damage, or have two damage less turns followed by one splitting headache?
How do you deal with all that brain damage?