Mav,

I will agree with everything everyone said about the ZEN50 except that (and its only me) I have had a few problems with the retracts; yeah, my landings are near perfect now and I have stopped breaking any gear. In the air it is nothing short of spectacular in its performance. I have a YZ63 with a 12x7 apc; it is fast and flies as if on rails; inverted, knife edge, loops, very very low passes about 6in from the ground and then a vertical to almost out of sight.... you get the idea Mav.

I was keen on getting the ZEN90, 120 or even the 140 next, I picked up a Calypso with YZ91 on this site instead, be here soon.
The ZEN90 will not go with the OS70, you will need at least a YZ91, Saito 100 or like someone I know flew it with a Saito180.

There is nothing like it in its price range, not that I know of.

If constant speed is what grabs you, go for the ZEN50.

Let us know how you make out with the flying.

Vim