I decided to try this out yesterday and I am really diggin' it. I experienced the same thing with the icon duplication that VickyPaz described but applied the same strategy of hiding the extra icons and that worked fine.
I had been using Surreal prior to this and I'd say there are fewer lags using the Crossbar theme compared to Surreal and the Dimension L theme which I had used for months and months prior to getting Surreal.
I did change the wallpaper to something a bit lighter for the home screen just to make it a bit more functional for me.
I've paid for three or four themes in the past year and this is a pretty darn good one.