Good evening, all! I agree with Mikeyw - I've had my 159 JTDM Lusso for 6 years this month. I'd had two 156 1.8 Lussos, bought new in 2000 and 2003, and picked up the 159 in 2009 at 16 months old. It has been very reliable thus far, with 73,000 miles on the clock and is probably the most comfortable long-distance vehicle that I have owned in the last 50 years. It has no difficulty keeping up with the traffic and will achieve 50 mpg on a long run. Nothing that MB or BMW has produced gets close in the style department! Apart from new upper and lower nearside front suspension arms and a replacement EGR valve (both this year) it has been trouble free.
It's a pity that AR has been so slow in producing a replacement; I hope that the Guilia is worth the wait.
Regards, and happy motoring!