Yeah, I went to the SpinOlution site and saw that. They didn't have a price on the spinolution site so I took a gander at the vendors sites and Yeowzers!!!
I wouldn't exactly call it a double drive (as you can just as easily use one foot or the other to drive it) I like to refer to it as "pivot drive"
I know, I know, no one else calls it that. O well!
What I've seen of the spinolution wheels is really quite impressive. And the whorl speeds on that little bugger are like awesome!!! Really slow to dang that's fast. It's also a scotch tensioning system (the brake is on the bobbin and the drive is on the flyer. If I had that much money just hanging out I would sooo get it cause it would definitely fit on the bike!!!
Congrats hun!!!! Yer gonna have fun!!!! With those kind of ratios you'll be spinning sock yarn in no time!!!