I agree, you would have better luck getting answers on the 2 series forum but, as you as see; a lot of current M2 owners once had the M235i, including myself. IncredibleNewt's answer is very informing since he/she has a lot of miles on his/hers. I had my M235i about a year and a half, with close to 12,000 miles, loved it, and had no issues at all.
My only issue was still wanting an M2.