I bought Turbo Link because it was the only thing that would work on an 84 ECM. Since I converted to an 87 ECM and had some problems I recently ditched TL and went with DS. It is like night and day as far as the information detail, 18 frames per second with DS compared to one frame every second or so with TL. You can also get some good deals on DS and a computer now too as a lot of guys are trying to sell their DS because they are going to a Power Logger.
If you want TL pm me and I will sell you mine cheap.