I had a 350z and now i'm driving an E85 Z4!
I sold my 350z and bought a brand new E92 sport plus. After a few months i was bored with it, so tried trading it in for another 350z but trade in prices were terrible.
I ended up compromising and trading it in against a 2009 Z4, as i bought the Z4 from a main dealer i got a fantastic trade in for the E92 as it only had 1000 miles on the clock.
Both cars are totally different, the 350z has loads more room, much more comfortable on long journeys and feels really grounded but poor fuel economy!
The Z4 is much lower to the ground, great on fuel, but a bit twitchy, due to the run flats and also tramelines really badly!
The interior on the 350z is much better, as the z4 has alot of soft touch plastics which wear really quickly. I'm having to replace the steering wheel inserts due to excessive wear with only 27000 miles on the clock.
I'm defo going to buy another 350z or 370z in the near tuture, but i'm reasonable happy just now and i'm enjoying the 31 mpg.
I think if i had bought a Z4 m coupe/ roaster i would prefer it over the 350z but they are at least another £5k like for like!