I use the 5mx very good it is too. It can be extensively programmed but I use the built-in stuff and have come up with a number of useful spreadsheets that answer Q's like It's 28degC at Sion, 8 pax turn up and loads of baggage can you get enough fuel in to get you back to UK in a 125? Can it be done?
The data base is great, full of A/field data (important stuff like hotels, pubs and eateries!)
Does Emails, faxes & SMS without hassle - needs a mobile (preferably IR) with inbuilt modem. Has a back-lit screen and the lot runs on 2xAA that last roughly a month. Go play!!