The MOHAA overlay is quite useful and can be adapted to work with other games, particularly those that use Q and E for additional movement (such as leaning around corners.)
For this kind of money, you can hook yourself up with a gen-yoo-wine OmniKey. Personally, I swear by the 101. Kenn and Thresh prefered the Ultra.
The MOHAA key spread for the left hand is great. Everything else is marginal. The small, slippery keys that jut out a quarter inch from the keyboard are round and, lacking an edge, are difficult to grasp.
Ideazon seems to be planning on selling an individual overlay per game. Not exactly what gamers are looking for.