We are Demarini resellers and have reviewed and tested this year's bats.
The Ultimate, Reactor and Patriot are the old standbys. We use the Reactor and Patriot as cage and cold weather bats - your typical low end bat. The Ultimate has been around forever.
The F2, Vexxum and EVO are end-loaded and use the half and half technology. These are end-loaded and have a lot of flex to them. It takes a while to get use to it, but you do get a lot of pop.
We are taking a strong look at the new Medusa for our slappers. I'll let you know what I think after the girls work with it a bit.