I've been using the 10' F45i (actually 9' 10") on my '90 Westy for about
four years now.  I like it.  I've had problems but they were my fault, not
the awning itself.  Just don't leave it up in heavy rain and een be careful
in light rain over a long time.

The A&E/Dometic Horizon is a Fiamma, period.  I've looked closely at them at
Camping World, they are the Fiamma F45.  And I didn't see that much
difference in price if any.

BTW, when I bought mine I got it through a local dealer and they were able
to beat the hell out of the best prices I could find on the Internet and
that included shippin, local tax, and installation.