Mrs. M. and I have a sat nav each, mine is a Tom Tom, hers is a Garmin. Mine drops off the window within about 5 miles of leaving home, it's always been rubbish, Mrs. M's is better but is getting on a bit now and is starting to drop off too. Looking around I see some bean-bag holders for sat navs, has anyone tried them? are they any good? Or is there an alternative better and stronger mount out there we could use?