They seem to have better keyboards, however clam-shell design disadvantage is that you always have to have the keyboard out in order to use the device.
The Astro Slide isn't a clam-shell, unlike their first two offerings. I have a Gemini which I use as a PDA and it's great. The Astro Slide should give me the best of both worlds, (I have one on order).
Yeah I've looked at the Gemini and Cosmo before but the sliding design of ProX and Astro Slide is what makes me seriously consider buying one of these devices (in which case I'd lean towards the Astro).
It's more like a miniature laptop than a phone.