I don't have one, but I heard they were cheaper for a reason! I bought a Gemtop GT Classic, its a flushmount made out of metal AND fiberglass. The surface is so smooth, its like a mirror !
Downside... it cost me 1200 CDN after tax, painted and installed.
are you getting the checkmate FX one? i Have that one and it didnt come all wavy cuz the cover is made of a dual sided fiberglass board. comes in white or black(all they do is flip it so if you say white, its black inside). The frame is made of aluminum and the corners may need work, mine do. Also when you gat it lay it on the bed before you put the seal on....you may need to change your underwear afterward cuz it looks sick without the seal. I will eventually finder a thinner seal for mine..