I'm not aware of any problems with either year.
If you have got 6 months before purchase then start looking at the Z4.... you might find that it grows on you.
If pricing is the same, get the newer one. If the old one is cheaper then get that one and spend the extra on a couple of upgrades.
<span style='color:blue'>"So my BM makes me a flash bastard? Then I guess you're just keeping it real from the seat of your nova?"</span>
<span style='color:gray'>"...and the home of the brave..... is bravey 130bhp from a 7 litre engine? 100bhp/litre or don't bother building it!"</span>
<span style='color:red'>"Aaahh the UK; where every road is jammed, under construction, poorly maintained and unfairly policed, at least we don't get over-taxed for it........ HA HA HA!"</span>