Super easy to install (I [carefully!] used the rubber mallet technique) and seems to be really well designed with clever seals so the bearings should last well in Welsh slop. Can't really feel the change in head angle but I'm going faster downhill so must be doing something good!
Had this chainring for over 6 months and no dropped chains at all. Used with 10 speed slx/deore stuff with no chainguide needed. Looks to be lasting well (has outlasted 2 new chains and cassettes already)