I have one, I'm not really all that crazy about it though. I guess I need to cook more, because I never used half the stuff it grew. Started with the herb kit - I did use the basil a good number of times. The chives never really grew very well. The thyme was ok, but never really cooked with it, so it mostly just sat there. The basil grew the best.
Then I tried the salad green kit. That one worked ok, though it never made enough lettuce really for a full salad, but was decent for picking off a couple leaves for sandwiches and stuff. I tended not to use it fast enough though, and once it gets long the taste got kind of bitter.
Next I want to try the green bean kit... though I know already I'm gonna complain it doesn't make enough green beans to make it worthwhile, yet at the same time I'll never get around to harvesting them.