Stik,
I have the EDM700 but not the fuel flow. I think its great. It keeps an eye on everything and records everything so that if one day something seems wrong, you can go back and look at when and whether something changed.
The fuel flow adds considerably to the price. I decided it wasn't worth the extra.
They now make a unit with a bigger display which I would have got if it had been available when I purchased mine.
I only wish it read oil pressure as well as oil temp, then all the critical parameters would be monitored automatically.
ZA
Give me a call if you want to discuss or see some of the data.