I will be straight up honest with you. No you don't need one. No one needs one. The "question" is do you WANT one? I wanted one. I can get just as fine or sometimes finer detail with my HP-B. But cleaning the B is more of a pain. I love my Microns. The SB I just got is awesome. If I didn't have the HP-B I would have ordered the Micron B and not the Micron SB. In my experience it is a bit easier to get detail with the B than the SB. The biggest advantage to me with a Micron is the cleaning. You can pull the head off and clean without pulling off the nozzle. The only other advantage with the SB is the multiple side cup sizes. I don't think you would regret it at all.
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http://fredaw61.wixsite.com/the-artist
see, thats proof @RichardH its all down to individual use and preference. Not that i'm at your skill level @Airbrush Dreams, but i find it easier to get detail with the CM-SB than the CM-B (both .18)