I used the glide with the roller setup for about 2 years before I installed the glide. I far prefer the glide, and here's why:
If you *forget* to move the pin (which I often did) when clamping a thicker piece, the racking of the vise would then force the roller wheels out of position (chop wracks, forcing the parallel guide out of parallel). And with the glide wheel, it's easier then you think to apply a lot of force and move those wheels out of position. Then, of course, you need to loosen 4 bolts and get everything lined up again *just so*.
None of these issues with the criss cross. It's just as smooth, no tweaking. I'd argue that installation is easier as well.
Here's my two blog posts about installing it:
http://brokenfingerswoodworking.tumb.../smooth-action
http://brokenfingerswoodworking.tumb...04/criss-cross
- Matt