The Kiss+ chamois that they are using is new. I have a few pairs of Visio shorts from 2007 and 2008 and they use the Y-Pro chamois; the new Visio short has the Kiss+ chamois. The Y-Pro chamois is definitely different than the Kiss chamois. I wouldn't hazard a guess whether the Kiss+ chamois is more like the Kiss or the Y-Pro.

The Terry Bella shorts are equal in quality to the Castelli shorts, just different. They are made of a nice, high-lycra fabric that is very supportive but still lighter weight than the fabrics Shebeest uses (I think Shebeest shorts are a little heavy). It's a little "slippery" -- I find myself sliding around on my saddle more than normal in my Bellas . The no-elastic belly yoke is very comfortably and flattering. The chamois is pretty much identical to the Shebeest SSS chamois. It's a bit thicker than the Castelli chamois.

As to which Castelli shorts to get... I have Visio shorts, Cocoon shorts, Zen shorts, and an older pair of unknown model with a Kiss chamois. This is kind of a personal choice, but I would steer clear of the Softlex fabric. The Softlex fabric is basically jersey material. It's soft and floppy. I don't think it's a great shorts fabric, but they've carried it through a few seasons so apparently some people like it. It's actually not SO terrible I guess, it is soft and silky, but if you're looking for a pair of shorts that will hold up and be "staple" shorts, the other fabrics are a better bet. The Zen shorts use "Affinity Lycra" which is better than the Softlex imo. The Visio short is made from a fabric that is even heavier and more supportive than the Affinity lycra and it's quite nice. I can't really give you chamois advice because I'm not familiar with the Kiss+ chamois.