No experience with the 800, but in the 900 motors, cams & compression are TERRIFIC mods. However, there's a big difference between cams, I've used VeeTwo in the past (they make several grinds) but with the exchange rate, they've gotten pretty pricey.
I have a M900Sie 2001 ,heads done
I read somewere that the 2001 cams are very good (almost the same as the ST2 cams)
I am thinking about putting some hi comps in when it gets his next service
What would it bring ,and which hi comps should i buy