I have a VP-4E Nav which still works well. The only drawbacks are 1: the somewhat unpleasant timbre of the audio and 2: the fact that it's not GPS linked. It'll get replaced when I put a PowerFLARM core unit onboard as I will want a computer that uses the FLARM as a GPS source and logger. 7007 Basic or 8080 Simple are the main contenders for me.