I have the AFS now. I like it. Yeah, it is noisy, but I don't really care about that since it's back behind in the fish room. But before that, I had this:
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4430+13988&pcatid=13988
And it was very much worth the $16. Unless you really need the integration into the rest of your timing from Apex, not sure the AFS is worth $84 more.