yes they work great, the thing is they need a good gallon or more to break in. i work with one off of a tower trainer (the rtf) and it runs well once it heats up (im an instructor so i train noobs all the time). if you dont let it warm up it will not run below half throttle due to the fact the engine is so tight. this will go away as the engine breaks in but dont expect it to run great out of the box cause it wont. after a few tanks it gets better and after a gallon or more its great