CM Sentinel Advance II Mouse and RX Pad Review @ OCC
 

If you enjoyed the Sentinel Advance and are looking to replace it, this probably isn't for you – you probably won't notice too much of an "upgrade." However, if you've never experienced any CM Storm Sentinel, then this wouldn't be a bad starting point. In the end, it's a pretty nice mouse, but I wouldn't call it much more than its mother – the Sentinel Advance – the II is really just marketing at its finest.

http://www.overclockersclub.com/reviews/cm_sentinel_2/