From what I heard from my TPS classmates who flew it, the L-39 is pretty underpowered and underwhelming... According to them, you'd be better off with your own T-6- less fuel burn, and better climb/turn perf. Seriously.
Hopefully said guy wasn't claiming to be from VX-9 or anything. I'm kind of irritated that he "borrowed" their paint scheme, unless he's actually an alum.
No VX-9 guys but lots of USN types (including a few with Demo team experience).
http://www.warriorairshows.org/#!flight-team/cuy0
Interesting about what your TPS classmates' impressions were. What's the going price for a T-6 though? I never thought that the L-39 was attractive from a purely performance standpoint, but more because it is cheap to acquire/maintain for the performance it brings.