I run XT/slx. works GREAT. Its SLX shifters/front der and XT rear. The XT has given me no issues yet so I havent had to adjust it but once after 500 miles. if it does break then Im gonna replace it with another. The slx shifters are far more than good enough for me. Havent used anything better though. Id say so slx if your not going to race. The "shadow" design is what to look for. It appears shadow gets better reviews than XT too.