IO540,
I use the Fx8 with Jeppesen European charts, the unit comes with the charts preloaded when you buy.
You connect it to a PC on which you have Jeppesen services loaded and the update precedure is straight-forward.
You pay about €70 per annum to update this way through your Jeppview subscription.
The FX-8 is indeed made by iRex.
I tried for ages to find a way of putting the charts on the Iliad but to no avail.
I still carry the Iliad with the avionics manuals etc. loaded and just one big file with
the relevant countries on a Compact Flash card. Tedious, but better than nothing if the
FX-8 falls over.