I can't say enough about the flight characteristics of this plane. I had it doing the most violent blenders this weekend - they look incredble. On my 8th flight I had it coming in for harier landings - and I'm not a 3d expert. It makes me look good. I think I'm going to stick with my OS91 FS set up. If I only had more time to fly I'm sure I could get into a good torque roll. It hangs on the prop great (nice sweet spot) but my thumbs can't keep it there for a full revolution. This plane is worth every bit of the $205 I spent on it.
Yes, fiberglass the firewall area - or beef it up with triangle stock. Mine too started to separate, luckily while only carrying the plane and not flying. I might also look into taller landing gear. I'm using a 15x4 fun fly prop and it likes to mow the grass. I only have about 1" clearance.
I'm a little concerned about the "brittleness" of the CF wing tube. It's the second one I've heard of breaking.