Ive had my F3 for as few weeks now, and its a decent enough box for what I want it for (53E / 52.5E if the European beam is ever lit up again / 42E & possibly 26E or 39E depending on where the next lnb gets installed)
However Id hesitate to recommend it as mine has a couple of annoying quirks.
The front panel clock is completely useless - its losing anything up to 10 minutes a day! A bit of time drift is to be expected, but thats terrible. I have left it unadjusted for 2 weeks - its currently 1145am here according to my radio corrected clock, or 1002am according to the F3
The remote is plasticky and insensitive, and the buttons are too small.
I dont get the insane urge to take the F3 outside andgive it a half hour introduction to Mr Pickaxe like I do with the horrible Duo, maybe just take it down to the pond and practise my frisbee techniques
I know a few folks have said its fairly sensitive, but I havent noticed any improvements over the other receivers Ive got here.