My Stumpy is now about 5 years old, but the review's still relevant, cos these bikes last forever!!
Well I'm not a delicate rider, and I've bust a few bikes.
So I chose this looking for a something which could take a battering, still be light and last.

The M2 is Metal Matrix, a quite rigid material, which is lighter that Alu.
I bought the bike with rigid forks, unheard of these days and added Manitous for suspension later, which I'd recommend.

I've used a few rear mech hangars, they tend to bend if you're me, otherwise my M2 is going strong still.

If you can even just buy the frame and build it up, go for it. An exotic bike which is good value.