I just traded my Slate VBC for PSP Echo. Can't wait to play with the new toy! :)
Slate VBC is a cool product if it stays stable for you. I worked with Slate, but they could not recreate my issues there even though I could easily duplicate by turning on the 24bit engine. My projects <seemed> to get a bit more stable in general when I pulled out this plug, but that is a subjective statement. Run the demo and see - if you like it and it is stable, you are probably good to go and take advantage of a nice sale.
PS: I love Slate Virtual Tape and Virtual Channel, and I'm starting to dig Slate fGX - it's just the VBC that gives me problems.