I am using an Ideazon Fang. Ideazon/Zboard went out of business and SteelSeries bought out the gear. They haven't updated the software in ages but it is easy enough to configure for a new game. I have been using my current one for 3 years and bought a replacement for whenever it breaks.

I use the Fang on my left hand and positioned right next to the 18 keys on my Logitech G15 which gives me a huge amount of keys for 3 boxing Rift.