I have been using the Jeppview electronic plate service for a couple of years after getting fed up with the Aerad paper updates. My life seemed to be spent swapping bits of paper!
I have Europe wide coverage and find them excellent. Only draw back is they do not have a Mac version! It runs fine in Windows Vista inside the Parallel emulator though.
I run it on a tablet PC as well but not in the aircraft. My GNS430 has the plates in the database and I prefer paper plates clipped to the yoke. So for a trip I just print out the plates I want and put them in little A5 plastic pockets. On a touring trip I take the laptop and an HP portable printer and just print them as I need them.
I also have Flitestar IFR and the two interact with each other perfectly. You can plan a trip in Flitestar, it will do an entire trip kit including the approach plates.