Report: I have a 2013 135is convertible. I traded a 2007 335i convertible.
The 135 is smaller, feels more agile, and I'm sure it'll be faster when it loosens up. I really like the 7 speed DCT. The exhaust is very snarly.
I've driven the 3-series M and felt it was too much like a hammer, so I do not miss the 1M.
I hate the tiny back window but do not plan to back up all that much anyway. I miss the little red LEDs in the interior, and the cup holders. I am mightily pissed off not to get LED angel eyes, since there was a 2012? 1-series at the dealer that had them. Wonder if I can upgrade.
It does have an odd LED eyebrow over the lights. Small comfort.
I wonder why I got a convertible in February in Michigan but it seemed like a good idea at the time.
What else can I let you all know?