I recently bought a Genesis ReAct wrist module, (Nitrox capable) at my LDS. I have used it on 12 dives, (San Andres, Colombia.)
I found it to be easy to use, large fonts and the graphics are good. It would be nice to have a safety stop timer, instead of pushing a button to keep track of time on the second screen.
I also got the ReAct download interface and software. Unfortunately, it will not function properly on my new PC as it is running Microsoft XP. The software loaded after a few tries (errors were displayed the first 2 times and PC locked up on the 3rd try - but installed on the 4th time.) The nesting and serial connect does not work as I believe that XP keeps the COM ports open and the interface looks for a closed port. I thought I was doing something wrong, so I loaded it on another PC under Windows 98 - install went well and the interface worked. As an aside, on one of my shallow dives [34 fsw] the dive profile on the PC showed that I made a QUICK descent to 269 fsw - temp was 125 degrees the a FAST ascent to 5 fsw and 65 degrees! I don't remember doing that (must have been really bent) and neither does my wife (buddy.) as this was shown to have occured within 1 minute. The temp of all our dives was 80 - 81 degrees.
I tried to install it under a PC using Windows 2000 - same problems as the XP Operating System. According to Genesis, it will not work under XP, but should work under 2000. I was going to switch to the Mosquito, but Suunto says that their download package does not work under XP.
So I am waiting until the Mares M1 computer is available (I was told April) and see if the download interface (called Iris) will work under XP.
But I like the ReAct and the computer is easy to use and read.