Hi Minethere, Unimpressive is not a word I used though, that would be invalid and unfair, Inworldz are like all of us, working with software that is work in progress although stability of current OpenSim releases is a lot better than earlier versions and can even be less laggy and more stable in some ways than Second Life.
I think and I may be wrong, that Inworldz is using a early release which they have modified heavily, there are pros and cons to doing this with software at the alpha stage.