I just ordered an Ergo (yesterday).
If they update it inside of a week or two that'll be bad luck on my part, but oh well.
I tried one out on the Columbus trip I just went on. I won't load it up quite as fully as possible - for those rounds I'll use my Contenders, or my Grip, or my Mahal, or my Prodiscus (though I think I'm selling that one).
I'll use it for my "lower disc count" rounds where I just want to take 10-15 discs out instead of the 25 I carry in my Contender or the 22 or so I can fit in a Grip. It carried the weight well and felt like there was nothing on my back - very nice.
I'll probably also pick up a Skirmish here at some point, but other people are plastic whores or dye whores, or something, and I guess for now I'm a bit of a bag whore.