Yes, the Power Adapter has the wheel. The wheel is just a little too small for me to make as fine adjustments as I would like. Not horrible, but just a nit-picky thing. :)
aesthyrian's link is correct. I got mine from MF as well.
Got my Power Adapter & I love it! I love the control wheel, but is there a chance it could be made a little larger in later versions for fat fingered people such as myself? (to MF)