I got the Elite Controller series 2 last night using the £80 Game trade-in deal with the series 1, as my series 1 was starting to show signs of the left grip coming unstuck.
The series 2 is a thing of beauty.
The small paddles are even smaller on this version, and perhaps positioned a bit higher or further towards the middle of the pad. Whatever it is, the paddles are no longer brushing up against my ring fingers, which was slightly annoying in the series 1. That, combined with the extra resistance means the paddles feel much more like an essential, integral part of the pad rather than a slightly awkward extension that you'd keep activating by mistake. You can now put the pad down with much less chance of these upper paddles being activated. I might even try the lower, larger paddles as well, but I suspect that'll still interfere with a comfortable grip too much.
The hair triggers are even better now that the throw can be reduced right down, making them feel more like bumpers. Also, the software auto-adjusts so a more shallow press still equals 100% so you don't need to fiddle around with any settings. Once you realise that the analogue aspect of the triggers is generally only used for gas pedals and throttles, it makes sense that you can turn them into digital buttons for shooting games with the flick of a switch. And, because it's just a flick of a switch, you can easily switch modes in games where you move between on-foot shooting and in-vehicle accelerating/braking.
You can now assign a shift button. I couldn't initially think of a use for this, until I remembered d-pad weapon selection systems like Gears, which I don't like because you need to stop moving to change weapon (or awkwardly reach across to try to press the d-pad with your right thumb). So I set the left paddle to Shift and the face buttons to act as the d-pad when shifted, which means weapon selection can be done without taking your thumb off the left stick. It works brilliantly - just like the weapon-select on Red Faction Guerrilla, which is one of the best systems I've used.
The software seems much faster to open and use than before. It's still a bit annoying to have to go into the software to check which profile is assigned to which slot - with three slots it's now easier to forget how you've set them up. Ideally you should get a notification in the corner of the screen telling you the name of the profile when you switch to it, or even better, it should auto-switch when you boot up a game. But having three slots is much better than two, and you can hold the profile button to turn it off completely, which is useful.
I've not messed with the stick acceleration profiles yet because I don't understand enough about aim acceleration in general. In theory it might be able to fix dodgy aiming calibration in games like RDR2 - where it's really hard to aim accurately without overshooting your target - but I need to investigate more. In any case, that's not a new feature for the series 2.
There are a bunch of other improvements - a much nicer Guide button, the amazing case/cradle for easy charging, nice dappled material on the grips. I've not tried the stick tension adjustments because it's not something that's ever worried me.
Overall, I love it.