ObjectivelyIncorrect

I'm looking to buy a new phone with a physical keyboard, and was wondering how this compares to the Cosmo communicator, as I'm currently deciding whether to get the pro1 or wait for the upcoming Planet Computers Astroslide, which looks similar to the Cosmo. I've heard people on the forum say that the pro1 is much better than the cosmo, but I was wondering why. Is it mainly down to the typing experience and thumb typing vs typing with multiple fingers?