I would say for the price you could get a much better engine. A friend of mine had 2 of these engines (alpha .21 and .24). They had alot of power but where hard to tune. And when they did run alright the run times sucked compared to other engines of similar price. There are better engines out there I would personally look elsewhere.
+ Good Power
+ Reasonable Price
+ Easy break in
Power band was kinda so so i'v felt smoother but also felt jumpier
- Hard to get good tune
- Run times
- Reliablitity (one cracked piston and the other got sloppy bearings after just over a gallon)