I bought a used BC29 a couple of days ago. Paid a little less than you. It had been modified with a cartridge filter and UV - I've been researching options on setting it up (the way I want it). It looks like they come with a skimmer - most say you don't need one on such a small tank. My guess: this is to try to make it user/newbie friendly. I'm looking at clean up, set up, and live rock / water in the next month.
I'd say buy it, start researching, have fun.