So I'm nearly at the point of pulling the trigger on a rear shock for the XTR

I'm now torn between the YSS and the Hyperpro.

now I know the YSS is a bit of a unknown, but everything that I can find about them is from guys doing RTW journeys with no complaint at all about the handling both on and off road. to match the rear I was thinking of either getting some spacers made for the forks going for 20mm instead of the normal 30mm. But I've heard nothing yet on it being a rebuildable unit although I suspect it will be.

Now the Hyperpro is accepted as the standard cheaper replacement for our bikes but are they rebuildable and can they survive off road use? Does anyone have experience with their progressive springs in a XTR and in the dirt?

The other factor is cost, the YSS combo will come in around around �150 cheaper for me as I've a machinist who owes me a favor or 6.

So how do spacing the standard springs work in off road applications?