PDA FlyMap on Loox
I've used the Loox 560 with FlyMap for about 6 months, and find it excellent.
I use it in a PA28, attached to the yoke (a converted bicycle handle-bar mount) on a short 'swan-neck' which can be angled to give the best readability in sunlight.
It is easy to follow in the air; gives good terrain warnings (although only ever got close enough to the ground on approach to activate them); gives good warnings of restricted/danger areas and airspace.
There is a black line showing easily where you are heading, whether you have a course mapped or not. Also keeps a good track of your actual route which you can then download back to the PC and see overlaid on the CAA chart to see where you really went.
I don't have any problems with the buttons in the air; just get to know what they do (like everything else).
Very easy to plot and use with the Windows software to plan the route then load it onto the PDA, with PLOG for wind-drift/heading alteration etc.
Also shows controlled airspaces and terrain heights en-route well.
With a good colour printer you can do a print out of the relevant bit of the CAA chart with the track on it, so only have an A4 page or two to manage in the cockpit and can do a print-out at closer scale/easier to read than the real chart (need the real chart of course also).
The Google Earth integration feature sounds like a gimmick but I actually find to be quite useful - you can see what the approach to an unfamiliar airfield actually looks like from the height you fly at. I often print out a page or two of this near a new airfield to make it easier to spot it.
Recommend
(1) get the longer lasting battery (lasts maybe 5 hours when fully charged and using the 1-minute backlight auto-off
(2) set the auto-backlight off to a minute to save battery life in the air - its all you need to see where you are/are going
Things to watch out for:
(1) the NOTAMs seem to be incomplete - often find other NOTAMs shown on AIS and given graphically on NotamMap or UKGA.com. Also, the NOTAMs shown are not entirely accurate as it seems that it can only draw circles, and some (exercises etc.) are odd shapes
(2) the battery life indication is not accurate - it will show full when it is far from full. E.g. with the longer-lasting battery it can show full with just 1.5 hours life, but can last 5 hours when fully charged. I find that the larger battery needs overnight if low to fully and the standard battery several hours