I have never flown with this unit but I think any GPS which shows the actual real "printed" VFR chart is just brilliant.
When I fly UK VFR I am always running such a setup (on a 8" tablet computer; a bit clumsy to be recommended). It is great for complicated zigzagging around the edge of the LTMA, e.g. trying to stay VMC on top at FL054
A poor battery life is not much of an issue provided you have a spare cigar lighter socket. In my rental days, renting junk on which half the panel didn't work, I used a Skymap 2 GPS which had the same issue, but I replaced the cigar lighter lead with a 12V sealed lead acid battery which lived in the door compartment and which would last 10-15hrs.