Hi Graham, i bought a 92 M3 convertible at the beginning of January there is no comparison in chassis flex compared to a non M cabrio as for running costs i do most of the work myself is still expensive but most definately worth it. I imported my Cabrio myself saving quite a bit and is very easy to do, onto my 3rd import now. here's a web site to check out WWW.mobile.DE gives you an idea of price difference. I'm from Glasgow where in UK are you fro0m ?