The Tacx RLV concept was actually initiated from the Chasek Indoor
Trainer Routes, about 2 years ago, and that's why they look the same.
The difference is the Chasek Indoor Trainer Routes are aimed at the
"manual" indoor trainer market which in our opinion is more practical.
The VR trainers like iMagic and Fortius are PC trainers and cannot work
in a stand alone environment. You can purchase the TACX "FLOW"
head/control unit and then unplug the "telephone" type cable from your
iMagic control unit and plug it into the FLOW head you will be up and
running. The one difference is that you need to manually push the UP
or DOWN arrow keys on the FLOW head when the video tells you to do so.
Our manual Chasek Real-Time DVD's are based on TACX trainer technology,
so even though it's manual, it is totally compatible with the TACX
gradient levels that range from -4 to +9. The other difference is that
in the Chasek DVDs, you can complete a ride of up to 120km, in a
practical time of about 1hr 50min.
Our aim is to give the majority of indoor trainers who still use a
manual system access to real routes while training, without the
necessity to invest in the more expensive PC compatible trainers.
Hope this answers your question.