From my own experience:

Saito - what can I say, I love them. I have a .91(71 flights, ONE deadstick on the maiden due to it being too lean), and I just finished breaking in a 1.00 for my Funtana 90.

Magnum - Had a XLS .46 and it ran flawlessly from beginning to end. Easiest to start/tune 2-stroke I ever had. Several guys in my club have them, and tell me that Magnum's customer service is very good. One guy claims to have sent in a seized engine(he didn't store it correctly) and recieved a brand new one!

From the info I've gathered, YS truly makes the finest 4 stroke available. I am definitely going to get one one of these days and try it out.

Anyone have any experience with the new RCV 4-strokes advertised here on RCU?

OS - had a .25 LA, what a pos. Ran like crap from day one. Power output was anemic. Eventually would die all the time due to an air leak at the needle valve. I won't buy an LA again, ever.

A long time ago I had an OS FP .25(about 8-10 years ago). Can't remember much about it, other than it seemed to run pretty well.

When I was 12 or 13 I had a couple Cox control line models. The .049 was finicky to start sometimes, but tuned easily and I ran GALLONS of fuel through them without a whimper.