I have the AFP-30 and am happy with it. The fuel flow seems very accurate; I'd assume it's the same setup as the stand alone unit. It doesn't have a G-meter so I can't speak to that.
Their stuff works well, great value, and excellent service.
I've used the AFP 30, the G-meter/clock, and their dimmers.
I also have one of their audio gadgets but have yet to install it.
Good luck