In reply to UKC Gear:
Me, I simply record each session on Notes on my phone - how many climbs at each grade and in what style. Any firsts (1st time lead/dog a grade instead of TR for instance) I mark with an asterisk. If I'm knackered after the session then it was a good one, whether I rested a hell of a lot between 3 lead attempts or whether I've been doing strength endurance on autobelay. If I want to compare September to March, I just scroll back. I honestly don't give a flying f**k about whether one hand has grabbed a few more holds than the other one, and I'm missing the bloodstream probe on this thing giving me my average dopamine, endorphine and adrenaline levels for each route. Without this last feature I have no way of knowing if I've had fun or not.
Don't think I'll be buying anything from Mammut again; this kind of technology, developed and pitched for average climbers, quite honestly makes me sick. It has nothing to do with what are, for this aging git, the most elemental aspects of my enjoyment of this activity. And especially: I don't see a single advantage over notes (for the climbing sessions) and Excel tables (if you're taking your hangboarding or whatever seriously). So £170? No thanks!