My experience so far with the SR2 Titanium:
Comfort: This is the first Suunto watch in years where I don’t have any problems with the lugs digging into my wrist bone. It’s very comfortable and feels light weight. The watch is not bouncing around like the SR, because it’s slimmer (I use chest strap, so I don’t wear it too tight)
Sleeping with it: I don’t feel the watch on my wrist (I use with with a Run strap)
Screen: It looks great. I really liked the screen of the original SR, but this one is even more readable. There’s hardly any difference in the black of the display itself and the outer ring (if you know what I mean). The extra 0.07" are definitely noticeable, as well as the higher brightness.
Design: I find it a little boring, the original SR1/SV have more “personality”. It looks like a bigger Race S.
Buttons: As good as the SR1
Crown: It’s a little bit smaller than on the SR1 and it works great. Very easy to operate and precise. Also the haptic feedback is good.
Performance: I don’t see much difference between SR1 and SR2. Both watches are responsive and I don’t see any lags. I haven’t tried maps yet, but I guess this is an area where the SR2 is more performant. There are only two situations where a little lag is noticeable. Scrolling up from the widgets back to the watch face and from the watch face up to the sports profiles. I can live with that. It’s a sports watch not an Apple Watch.
Sound ist loud enough and vibration is strong enough during training (just like SR1)
Charging cable: This is finally a user friendly (=working) charging solution, and USB-C!
Saving workout and sync to app: Seems to me a little bit faster
GNSS: As perfect as SR/SV
Wrist HR: Looks reasonable outside of training. I always use a chest strap.
Battery: Too early to say something. I got it on Thursday, started with 98%. Since then firmware update, 3,5h GPS recordings, 24/7 HR, sleep tracking with HRV, no blood oxygen measurement, always on display, no smartphone notifications enabled. I am at 68% now.
Reasons to upgrade for me have been the new lug design and the bigger screen, and I am very happy with what I got.
For me the main difference between SR1 and SR2 is the improved comfort. Everything else is pretty much the same currently. I would not have upgraded if my wrist bone would be more compatible with the SR1’s lug design.
EDIT: My resources numbers are also far too high. I did a VO2Max session today and 1 hour after this training, I was back at 100%. I am basically recovering 24h/day, which I am unfortunately not in reality.