Pros: - Lightweight
- Crisp and quick shifting
- Strong cage spring
- Cost efficient
Cons: - No clutch system... yet
Recommendation: Shifts smooth and works flawlessly. Never had an issue with it. The short cage does have a very strong cage spring which translates into a lot less shifting issues. My X9's have seen a lot of wear and tear and their shifting remains smoother and more precise any any of Sram's lower models.
For my money I don't see the point of upgrading to X0 as it's almost twice as expensive without a significant performance increase.
Recommendation: Couldnt be happier, as a testament, a couple rides ago saw me pick up a small log that hooked a spoke and made a full revolution around my wheel! It bent the derailer hanger (i didnt notice it till i got to the store) and it was out of position by more than an inch. It still shifted perfectly! Good stuff.
Recommendation: Going one step higher than this seems ridiculous for the to me, but I understand if you have a ton of money to burn or if you just want the most expensive stuff on your bike, then you would pass up the X-9s and go for the X-0s. The X-9 system is great and I have not damaged, replaced, or been dissapointed with either sets I have owned (one newer, one older). Crisp shifting and very reasonably priced. Great shifting. I can't justify paying mucho $$$ more for a little less weight and a little more show. I've ridden the X0s several times and never have regretting decknig my rides out with X-9 series.