Ed, I am new to rc and got the TH .75. When I got it out of the box, the first thing I did was to check the compression. WOW! That thing was tighter than a nun's...um well you get the picture. I thought that it was defective and that it couldn't possibly be right. I have only put about 6-8 tanks through it so far, but have to say I am pleased. It is a little fussy right out of the box. Luckily I have a few friends that have been flying for years and I think we now have it just about dialed in. The thing really is a powerhouse. I'm sure the OS's idle better and what not, but for the money, I think it's great. Wish I had more info for you but lately the weather, work, and family have conspired against me!