Gripworks had a question about whether Porta-Glides worked for large dollies. The answer is yes. They are the same as other trough systems as far as that goes. I use Hybrids and Hustlers on them as well as Peewees (and Fisher 10's). I would be hesitant to put anything extreme like a dolly with a Fisher 23 jib on them (although I've done it) just because of the swing arm system they use. The wheels aren't directly under the troughs, they are extended out from them on swing arms. Like I say, I don't know that you shouldn't, I just didn't want to until I got the specs. As far as the wheels go, as Azurgrip says, they are different size wheels interspersed across the track, which keeps a smooth wheel always in contact with the rail, eliminating the bumps from flat spots. I mainly love them for this reason. It takes the headaches and second guessing out of moves where long dialogue necessitates sitting in one spot before tracking. I love 'em and the redesign sounds interesting.
Thanks CB and Megamoose for the play by play of the Fisher Open House and the panel. Sorry I missed it.
Sanjaya sent pictures and I'll go through them and post when I can.
Keep the discussions going. That's why we're here, to learn from each other and advance the craft.