Yet another in a slew of apps that won't allow a demo. For $2 more, you can get this:
From everything I can see, it's a lot more full-featured. It has a proven developer. It works in SL. (And if it has problems in Lion, I'll bet my paycheck he gets it fixed promptly.)
Oh, and you can take it for a spin if you want to try before you buy. Jeez, what a sensible policy that is.