e46 gps retrofit

Hi Guys

looking for some advice, want to do a GPS retrofit on my E46 has anyone here done it? most units come with Windows CE 6 don't you think its better to go for an android version?

I was looking and ebay and the android versions are about 2k more than the Windows one

so what's the best value for money? best os? reliability? and cheaper to import or buy locally?

EBAY_Android

EBAY_WindowsCE