I've never had an OM but I think they are neat products.
This is a wavebox:
http://www.tunze.com/149.html?&L=1&C...-infoxunter016
It moves water in and out of the box creating a displacement wave. Very cool effect but you need the right length of tank (I think 30" is the minimum - longer is probably better since ).
The only two fish I have in there are a Siganus virgatus (two barred rabbitfish) and a Psuedochromis fridmani (orchid dottyback).