Revvys are great in my opinion especially for the price (£15-20) I nevrr had a break in one yet, but thats because they are an agitator hopper (just juggles the balls in the hopper). Always good to have in he bottom of the kitbag just incase something goes wrong with the main one. Also very good for a mech apart from high profile!
Halos I have always had bad experiences with them as I am a heavy handed twat and aways break lids and press the on/off button too long and it goes into setting mode, 9 times out of 10 right at the start of a game! But that again is my fault!
Rotor my personal favourite hopper by far! Easy to strip and clean takes cheaper batteries (AA's) however when it to start to blend it blends the balls up good! Hence the easy strip I suppose.
Spire I have no clue on, I have never used one yet.