Flew mine without the wingtips today and it really changes the plane. I did leave on the SFGs though. Without the tips the plane is more violent and rolls/snaps faster and tumbles harder. The wingtips tame it down a bit and stabilize the plane a little. I'll put them on for lazy days and take them off when i feel like slamming some sticks and getting wild. The MXS is a sick plane i really love this one.
I think it may have been slightly more stable without the tips but nothing "make or break"Joe, did you notice if it harriered better without them? my 48" did...
the next time I fly will be without the tips.
-G