Shimano Deore XT M786 Shadow Plus 10 Speed Rear DerailleurDesigned to take abuse in stride.
You just can't go wrong with XT components. This derailleur performs in all conditions and hasn't let me down yet. The shifting takes a little getting used to as it is harder to push than a standard non-plus derailleur, but the reduced noise and chain slap is well worth the extra effort.
This is an excellent product. Don't waste your time with the "non plus" version unless you LOVE the sound of the chain destroying your frame. The plus system is excellent and the 10spd platform is perfect for 1x10 adventures.
No dropped chains paired with a raceface nw ring. Smooth shifting, reliable. I've heard about issues with the clutch failing but so far so good. I just keep a close eye on it. I've heard you can relube them if it looks like it needs it to help with the clutch issues.
The XT is in my opinion the best bang for the buck in the Shimano line. The clutch makes dropped chains a thing of the past
I purchased this derailleur to replace a SRAM X9 that had lost spring tension after a couple of years. The difference was night and day, the XT plus eliminated a lot of noise, and shifted reliably every time. There were no dropped chains or ghost shifts to speak of. After one year in service, I noticed that the shifting performance took a turn for the worse. I removed the clutch cover and found a broken piece, which controls the friction. Apparently this is a known issue with the "Plus" series derailleurs. It was replaced under warranty, so no hard feelings on my side. The shifting is now as precise as ever. Nonetheless, I have to knock one star off for durability.
Getting a Shimano "Plus" rear derailleur is easily one of the best upgrades to make these days. The clutch system is absolutely amazing. It completely silences the chain slap which is hard to believe until you try it. The Dynasys shifting is spot-on and very responsive. I'd recommend the medium cage if running this on a 1x setup.