If you're looking to switch your bike to a Shimano 3x10 system, give some consideration to SLX. With SLX 3x10 you get the excellent shifting performance Shimano is known for without the sticker shock of XT or XTR.
Bought these to upgrade from my Deore shifters on my bike - excellent purchase at a great price! The shifting is super smooth; I haven't had any issues when climbing and needing to shift quickly. I have since upgraded my entire drivetrain to slx and love it!