If you are referring to the Anywhere Map system, I would only use it as a backup.  The Windows based operating system gives me the willies (mine has locked up before) and the refresh rate insn't as good as a standard Garmin 295.  I purchased the software from them and use it in a 400mhz Ipaq 3950 with a compact flash GPS module.  It works great and has tons of features that most GPS's do not have (like the whole AOPA directory in there), but poking around with a stylus to get what you need in the air can take some time, and can be downright impossible in rough air.

Steve Reeves
Glasair I FT