I-Magic upgrade for Tacx Flow

I saw this on ebay the other day:
Tacx I-Magic upgrade

It is a kit that allows your Flow to connect through a computer. It can also interface to a video monitor with Virtual Reality so the speed/power image changes with your pedaling. If there is a hill it feels harder... oohh hahh.

I'm actually interested in the control through a laptop. There was a power comparison on the Tacx sevearl years ago and it is linked from my review posted here several years ago. It compared a power tap to a Flow and said that when you hook it up through an imagic upgrade that the accuracy improves. Also for the kind of intervals I do it would be nice to program it into the computer and have it run my workout.