None whatsoever, Ford. A couple of guys around here are doing just that.
But I gotta tell ya; once you try digitals, you won't be happy with less (assuming your ship has the integral precision necessary; you're still flying a Schluter, right? And that Fury will definitely show the difference).
I've been putting off trying them due to the unfortunate track record of JR digitals, so when I got a 9Z I said "Now is the time." Man; what a difference. I think the return to exact center is what makes them "feel" so good. Even a 9202 or 4131/8101 is going to wander some over the course of a flight. These 9252s go back to dead-center, EVERY time you release an input.
Yeah, they're expensive; and they suck juice. But just get a bigger battery. I'm running four 9252s plus a 3401 on throttle in a sport aerobatic plank that is exceptionally "groovy" and stable. It has the incredible stability of a well set-up pattern plane, yet will get downright ignorant on high rates...
It's the most enjoyable plank I've ever owned. Dunno if it is the airplane or the servos; a combination of both, probably.
I'm using a 2300mAh sub-C nicad pack, and still have some battery left after four 10-minute flights. It would need a charge after the fifth one, I'm sure.
I'm in the process of installing three 9252s (cyclics & collective) and a 9253 (tail) in the X-Cell, again with a 3401 on throttle. I'm figuring perhaps three 10-12 minute flights with the 2400mAh nicad I'll be using before starting to worry about how much battery is left.
This is probably a lot more than you wanted to hear, but I'm impressed...