I'd agree with FNG about handling - same applies to the Yak and IMHO should apply to all fun aeroplanes - response is immediate, is exactly what you ordered, and starts and stops NOW!
I think a wobbly prop is exteremly useful in aeros. In the Chippy (fixed pitch) I'm forever haveing to throttle back to avoid overrevving. This means you lose heigh faster, and there's always the danger you won't be quick enogh throttling back and the engine will over-rev. It could be argued that this is no bad thng in a trainer, since it makes you 'engine aware'.
In the Yak, you set full power and 82 percent RPM, forget the engine from then on (except Ts & Ps of course) and haul it around the sky - using both hands if required ;~))
SSD