Ive ridden my process up down along and over some pretty big hills, it doesnt pedal like an xc race bike, but its not terrible, ukge on sunday was 40km and 1.5 km of climbing and it was fine, well bearable!
A shock with a lockout/pro pedal etc helps, but i dont have one and I survive
the reach is absolutely fine (5’8 on a medium), just make sure your stem is no longer than 35mm, with some nice wide bars, after riding it, oldskool geo bikes feel cramped and twitchy
I have swapped the wheels out for light bicycle carbons on hope hubs to save some weight, making it a bit more all day friendly
I did have a bit of a problem with it throwing the chain in very rough stuff, but swapping the sram for a shimano mech (stronger clutch) and fitting an upper guide and its been great
needed a new set of bearings after 18 months, but had been ridden in some nasty weather