I have been using Slot.it controllers for a long time.
pfj - I don't have much comparision experience for digital, but I know for O2 wireless digital, it feels exactly the same driving an O2 chipped car with an O2 cartridge in the handle, to driving wired "analogue" (same wood track, same setup cars)
I think they are not for everyone because some guys just can't get their heads around setting up a controller for a car/class/track quickly when there are so many options.
One guy in our club who shall remain nameless, often I see him struggling, I grab his Slot.it, run one lap, make two quick dial turns, and maybe put it back from LOG to LIN mode (which is more fogiving if other settings are not optimised) - and hear "wow, that's way better"
- But a couple of weeks later - cue a re-run of the same scene.
But for me, I set it for one class, and maybe make one change of sensitivity if we drive a significantly different class of car on the night, and another to reduce braking if we run a class of car which has a lot of brakes. - I back off brakes about 30% when driving my Slot,it Nissan RAW, as the flat-6 has a ton of brakes, and we run very high grip levels, so wheel slide is minimal.
I race against Munter, and like most guys in our club, he has a high end controller - I always forget which guys are using Carsteen, DiFalco or 3rd Eye. But i do know I go as fast as those guys, and that I haven't had the reliability problems which they have all had in various areas.
I had one with a trigger jamming for right hand drivers only the other day, an assembly issue of trigger screw, or something I'd messed up when I changed to e case to yellow from std. green... but a 5 minute fix that should never repeat.
I also like the mode two braking, as it covers my sometimes poor braking timing, and if I have not got a car quite set up right, or it has a bit of 'hop", I can dial in some anti-spin to tame it out of corners. - Sure it costs me a few hundredths a lap, but if I have been lazy in setup, or just plain lacking in finesse in setup, it saves my bacon.