EASY to overpower this plane but it's a real good flyer when the CG and everything is dialed in. Running a O.S. 50 ringed on mine right now and it's SCARY FAST An O.S. FX .46 & 11/7 combo will hold it on the prop as long as the fuel holds out if that tells you anything .. this bird fly's like it's weightless.
The stock LG kinda stinks but greased landings are easy to get, unless you're on a rough grass field the LG should hold up o.k.
Have not had any problems associated with the mm screws or the tail feathers after 20 or so flights but I'm keeping a close watch on everything. The Mach II is a blast to fly, it's a true hot rod dressed in sheeps clothing and for the money ... hard to beat the FUN factor.
If this is truly your 2nd. plane I highly recommend powering it with a .40 unless you can use plenty of throttle control, it will still be faster than most low wings in it's class even with a .40
One of club members flys a Easy Sport 40 MKII with a AX .46 on it. It's fast and fly's great but .... the Mach II with a .40 will flat out run it in a straight line. Of course the Easy Sport weighs a tad bit more though.
Several of these birds are showing up at our club field lately and everyone seems to really enjoy them.
Enjoy... and fly it like you stole it.