I've a TomTom one which I've never updated, so it will occasionally get a bit confused, but no big deal. I've never tried any others, so don't know how to compare, but I do find the display a bit slow and jerky, which is annoying, and sometimes makes me miss the odd turn on a roundabout.
I was considering updating, but the display annoyance is also making me think about just getting a new one. Trouble is, if it's a case of "they all do that, sir", I'll be a bit miffed at shelling out for something that's no better than what I've got.
So, has satnav display performance improved over the last few years? Or should I just improve my satnav interpretation skills?