I used it to replace the worn out derailleur on my HP Velotechnik Scorpion recumbent trike. It operates very well. The only drawback is that the cable housing is inserted from the back and the one it replaces inserted from the front. This required that the housing be 17 inches longer and form a circle only a few inches less in diameter than the tire. It works well and the cable housing is well protected inside the saddlebag rack.
This derailleur provides everything I need for a 10 speed system with an 11-32 cassette. It shifts smoothly and quickly. It's a bit heavier than the Force or Red but I can't feel the difference. Great bargain.
I use this when I switch to my 11-32 climbing cassette which my SRAM RED derailleur will not support. It is obviously heavier and not as responsive, but it does a good job when I use it.