You're lapping it up!
Now you've put a few miles on it, how does it compare to the 350?
The car is pretty much used 7 days a week, and I've done around 1,200 miles in it.
Performance
Before the Z I had an Audi TT225 (remapped), that felt quick but the lag was a killer. This has very minimal lag, it doesn't matter what gear I'm in it just pulls. I've tried a handful of 0-60 runs for my own amusement, and managed to exceed book figures (even 2 up). It never 'feels' fast, as you feel safe plus the cabin is quiet with little road noise.
Comparing to the Z the gear changes/clutch is so smooth, silky smooth. It's enjoyable to drive as I'm not having to put my bodyweight into my left foot.
It's not as loud as the Z, and I miss the V6 sound, but the exhaust note is very nice (one of the reasons I went for the 335i over the 330i I test drove). Once you boot it, it opens up, and that sound is addictive.
Comfort/Ride
Yes run flat tyres are bloody hard, as is the MSport suspension, but it's not a huge difference to the Z. The comfy seats make up for it. Everything feels so solid and very TT like.
Style
I prefer the 335i over the Z. The Z was rarer on the road (I'd see 1-2 a week), as opposed to the BM I see 4-5 a day (albeit not a 335i).
Gadgets/Equipment
Well this has everything. The thing I miss which the Z had, is heated seats. I didn't even realise I didn't have them until a few days after buying. I was surprised, considering every extra was added otherwise.
I love the iDrive and iPhone connect, memory seats, welcome/home lights and handsfree. It's surprising what you need.
Running costs
They are higher. Insurance is about the same, I've got extended BMW warranty which is £60pm, tax is double the Z (£270/£460), MPG is slightly worse daily (24/25 compared to 26/27). Servicing no doubt will be more, but I've got another 9k miles.
Would I own another Z? No. It was enjoyable, but overall it was too basic inside and felt very cheap. The 335i feels like a nice place to be, even when tootling along with the other rep-mobiles on the way to work.
Town around 27, long A roads/Motorway 32/34.
OBC reads average 29.7 since last fillup 210 miles ago, with just under half a tank left.
Massive improvement over the 350z.
Currently reading 25mpg over 600 miles iirc.