RE: HI TEC 5645MG???
I'm a rookie and I use that servo in my XXX-T CR. Its been serving me well. I haven't raced it or anything but I've beat the hell out of it and have had no problems with it. I had it truckin through some pretty thick slop...sand...it seems to be doing the job well. Not sure what you plan on doing with yours but it seems to be a champ. I know its not the best...but I've been taking the middle of the road with my servos and I haven't had any problems yet.