I don't know if they've changed the software much, but I made the error of buying a GPS PDA with pocket flymap some years ago, and have been very unimpressed.
The user interface is often counter intuitive with some significant bugs (such as the failure to consistently find the nearest airfield) and the linkage with flymap win (the packaged PC planning package) is erratic at best.
The availability of chart updates was very poor, although I understand that the new supplier have sorted that.
G