The GenX series are great for running through a computer but it seems to me that it lacks a lot of the features that the GT-8 does. I use the two in cooperation in my pedal board. I use the GT-8 as the main effects processor and the GenX in a clean setting with a boost in compression, noisegate, and also assign overdrive to it for an extra kick...
If you're looking for an easy to use processor to hook up to your comp definitely check out the GenX series from DigiTech. The Boss units are usually a bit harder to use... You need to study up on the manual and mess around with it quite a bit to get the most out of it. The PodXT Live is also really good for hooking up to a comp... But the only difference between it and a regular Pod unit is basically the Expression pedal... The GenX will allow you to hook up to your comp and download tones and run your unit through your comp with a pretty neat interface... Also something worth checking out for computer based tones is the Line 6 Tone Pro.... I believe it's made by Line 6.... I saw it in a back issue of Guitar World and also an issue of Musicians Friend... worth a look. It comes with a bunch of computer based rig software and recording software too...