For rc cars I love hitech servos. They are strong and seem to last for ever. Helis are a totally diffferent thing. I have been flying helis for 10 years. I would and I mean would never install a hitech servo in my $3000.00 heli.
There is guys that do but most of them are newbies or club pilots on a budget. I have had almost every servo out there fail on me in a heli but only after 3 or 4 crashes or 400 flights on them. Not saying Hitech would fail every time but there has been a high failure rate with them in the past due to the high load and high vibration that a heli puts them through.
Here is a vid of a heli of what helis put there servos through
http://www.youtube.com/watch?v=RwHt6...eature=related
The new Hitechs that are out now may be great in helis I haven't been testing anything these days duue to the rc cars
