I just moved up this season from my trainer and have been flying the snot out of my UltraStick 40. Mine is powered with a Saito .62 so it's a bit light on raw power but has decent vertical.

Only changes I'd recommend are:

[ul][*] Get rid of the aluminum motor mount - mine required quite a bit of tail weight[*] A Sullivan tail wheel should work better but I'm still using the stock assembly[*] I've ripped out the LG block on one of my first landings. Changing the blind nuts to an SAE size and corresponding nylon landing gear bolts is recommended[*] The seams in my covering are loosening. Seal the seams with some type of sealer[*] I'm still using the supplied stock tank with no problems. Other club members have been having nightmares with fuel leaks and OEM ARF tanks
[/ul]

For an all-around utility-sport airplane, the UltraStick is hard to beat.