Skydemon fan
I've been using SkyDemon in the UK for about 15 months now (it's only been on the market for about 12 months, I was using the beta versions prior to the launch). Initially I used it for planning only and uploaded the routes to my Garmin 196, but have recently installed the in flight version on a Windoze pocket PC device, which is working superbly.
I haven't tried pocketfms. Prior to Skydemon I tried Memory Map (flight planning and in flight), Flitestar VFR (flight planning, routes loaded to Garmin), SkybookGA (flight planning, routes loaded to Garmin) and UKGA.com (flight planning, routes loaded to Garmin).
Of these, IMO, Skydemon is by far the best with up to date charts and airspace; NOTAM, TAF and METAR download and decode (plus interactive display of these on the planning chart); weight and balance calculation; fuel calculation; PLOG print; in flight airspace and terrain warnings etc etc (see their website for full details).
Download the 30 day free trial from their website, I don't think you'll be disappointed.