It ships with a MSM7627T which stands for "turbo"
from all the specs it looks like the exact cpu of the OV but bumped to 800. which of course, the OV can do.
before I looked it up, I assumed the Optimus Slider came with the 800MHx cpu that the Samsung Admire comes with, which is a much much better cpu than the OVs.
so I would say if you went from the OV to the OS, you really are only paying all that money for the keyboard and stock gingerbread. (of which CM7 has way way more usable features that are beneficial on a day-to-day basis)
I can't imagine VM will keep that as their keyboard phone for very long.
I am hopeful within 4-8 months we will see another high end phone join VMusas line-up. and If i were to guess, itd be a older galaxy S model from sprint, something with good support and good track record, like the Samsung Epic either with or without the keyboard.
id say wait a bit. but if you really gotta have a keyboard now, the Optimus Slider is definately a solid phone. just be warned that its outdated before you even take it home and something shinier will be out soon enough