The problem with the Velodyne or the Computrainer for that matter is you need to put a bike on it. The 300PT is a self contained unit. The other advantage to the 300PT is the fly wheel is solid. I don't have to worry my cat's or dog's (4 cats and 3 dogs) body parts getting in my rear wheel.
Computrainer
Velodyne
I have a computrainer and it is a pain to constantly put the bike in and take it out again. IMO Computrainer could improve their trainer stand to something more like Velodyne or at least add some type of quick release. The 300PT really looks nice compared to having a bike in a trainer stand. The other benefit to the 300PT is if you have a significant other or friend who also wants to train, it is real easy to transition between more than one person. You only have to adjust the seat settings.
Now if money is of no object you could buy the Computrainer Velotron ($7995.00). IMO though for this kind of money this setup should look a lot better. IMO it looks like it is from the 80's. I would have thought they could have a way nicer looking setup for 8K.