I have had both sleds, 2001 srx and I currently ride a 09 800r renegade. The srx was a fun sled, in fact I rode with a 2005 mach z (poor one) and beat him every time we lined them up. That being said, my 800r is unbelievable to 100. There is no way my srx would stay with it, would it catch it? Yes, eventually but you would need 1/2 mile or more to do it. As much as I loved my srx it's just not a fair race. The 2011 800 etec is a step up in power from the 800r. I sure miss the sweet sound of that motor (srx).......But my back thanks me every day for making the upgrade.
I have 3300 trouble free miles on my 800r, I did buy the BEST Warrenty and its good until 10-2014 so we will see how many mile I can get on the original engine.
Bill D