I've had a jet black for the past six year and as much as it is a PITA to maintain I just love how blck cars look (especially with tinted glass) when properly cleaned. I am lucky to live near a really awesome car wash place that does everything by hand. I see Porches, Aston Martins and even Bentleys pulling out of there so I decided to trust them with the cleaning of my bimmer. Every now and then when the weather is nice and I have time I will detail the car myself, other than that I let these guys take care of it and make it look awesome. Having said all of that you should be slightly better off with the metallic paint. Jet black tends to show swirls a little more.
2013 335i SPORT LINE jet black
2007 328xi - sold March 2013