Upload & Sell: Off
I'll pitch in for the Scarpa SL M3s also, have a pair and love them! Certainly weren't forgiving on my heels for the first couple of walks, but since then are very comfortable and quite supportive. Only downside to them is how heavy they are! Unfortunately that's something you get with buying one piece leather and a tough sole I guess. I actually thought it would bother me more than it has at the end of a long day, but I think by that stage I'm just so tired that I wouldn't notice if they were lighter anyway.
As for people saying this thread doesn't belong here, who cares? Certainly doesn't affect you negatively, and doesn't seem to happen all that often. Having said that, it probably is worth searching some of the bushwalking (hiking just doesn't sound right to me...) forums, as there will be plenty of topics on the same issue already started, which likely will have answered a lot of your questions.
Here are a couple of threads from a forum I frequent:
Scarpa SL M3 thoughts
As others have said though, and you suggested yourself, it really is about what suits you best. Unfortunately even trying them on in the shop can't always tell you how they'll fare on the track at first though!
All the best with it anyway, hope you find something to suit you