I had a manual interior mirror in my previous car and it worked fine, in particular when so many cars have xenons that dazzle without a decent amount of dimming. I didn't really want to get auto dimming on the A3 as my wife's mini has it fitted and I didn't like it as it never seemed to be dark enough, but just about ok. I ordered the comfort pack so got it fitted and it is in my opinion one of the poorest features on the car so much so I asked the dealers to check it was working (switching on/off) indicated it was changing, but it was marginal even in un-light roads. Anyway they said it was working and so I was stuck with it - looked to see about getting a manual, but that was to going to be easy so did a bit of DIY and got it to function where I could live with it - I blanked off the mirror side sensor and that did the trick - much darker and no dazzle, bit of a hassle having to switch the auto function on/off as it gets lighter, but preferable to the poor dimming I was getting. I am guessing I am alone as everyone seems to really like them on this forum.