To be honest, 99% of the time, it'd get ignored. However, there are times when I'm driving in the mountains of Central Europe, perhaps with poor signal for SatNav use, when a simple compass would be really handy. Of course, there's a proper analogue compass in my rucksack, but using it whilst driving is probably ill-advised!
Yes, I am a purist, but I'm also very much a fan of OEM+. If you can fit an ADRVM that's made by the same company as the original, with the same aesthetics as the original, but with greater functionality than the original, why not have it?
Cheers,
Tom