aholeinthewor1d,
I just bought the DSC356 because I was using a 355 at work and really liked it. There are the added speed selections, but also as soon as I picked up my new 356, it felt different in my hand...a little bigger in grip diameter. That's how it "felt"... and heavier.
One of the reasons I bought the tool was how good it felt in my hand, and how maneuverable it was (355). The 356 feels a little more bulky overall.
I'm going to keep it anyway, but those are my impressions by feel.