I seem to remember when I decided to go with the ASUS Transformer, the ASUS Slider was also mentioned that it would be coming to market soon as well.
As I recall, the Transformer was not as heavy when coupled with the keyboard dock and most certainly was lighter when just a tablet.
Since I use it as a "tablet only" 99% of the time, the Transformer had more appeal to me!
Other than that, I don't know much about the Slider...
