Test drove a 2003 Merc 320 CDI Avatngarde today ...& very nice it was too

Considering selling the missus's BMW 120D Sport , which should roughly cover cost of the Merc.
Problem is a friend warned me the early version of current E class had some electrical faults

I've no problem with a 60K mile car, but I don't want all that leccy stuff going wrong. One would assume if it's got this far , nothing should go wrong
Anyone owned one or know someone who has ?? Have they had any probs ?