It's free to try for 14-days.
http://www.spbsoftwarehouse.com
I started buying MobileShell at v1.somthing. I used MS3.5 for a minute. I do like it...it's a nice change from the WinMo UI standard...but i always find myslef back to plain-jane WinMo. Haven't really firgured out why, either. I get bored with UIs easily....even on my PCs...