I used to have one of the old ones that went thru a Nintendo unit and you plugged it into a TV set. It was a really awesome tool for the winter. However, I never wanted to touch it 7 months out of the year because I wanted to be outside. I guess that's same with any trainer. It's certainly the best trainer on the market, and also one of the most expensive.
Now lets assume two scenerios, one you spend the next three months doing disciplined training sessions on a good fluid trainer. Two...you spend next three months doing same on a Computrainer. Will you really be all that much better in three months from Computrainer versus fluid trainer? I'd suggest you would get very good results from both. The advantage of the Computrainer is that your training would be a bit more interesting, and you'd have quantified data that you would not get otherwise. I think the 'more interesting training' advantage would be minimal because many hours on 'any' indoor trainer is never really interesting at all....even with the data and the visual experience of the computrainer. I'd also add, if what you are currently doing is not getting you near the front of the races, and on podiums, then I doubt the computrainer will do it either. But, if you have the money to spend...I'm certain it will be a good tool, and you'll certainly get many years of use from it. It'll be great to have on those cold winter days when you can't get out on the roads.