Just remember they are BMWs. If you cannot work on them yourself, dealer service will cost as much as the bikes, and BMW dealers are not known for being friendly. Parts are also super expensive compared to Japanese bikes.
I won't spend more on a bike than I think it's worth, but if it's a good deal, I don't seem to have a problem buying bikes I don't need.
2002 Vulcan 750, 2013 Royal Enfield B5
2001 XT225, 2009 Genuine Stella
1980 Puch moped