I have had my OdorBusters filter for about 9 months now. And have nothing but praise for the quality. My buddy just purchased 1 too. I see his is a new design from mine. and seems to work better and my buddy use's a smaller fan than I do.
Just throwing back change!

I have a 6" Can fan and a Goblin filter. It was pricey, but it fits in the tent nicely nicely and the carbon filter lays destruction to the some of the worst dank. But it's worth noting that you need to run an exhaust line outside the house because skunk and carbon filter trapped in a room will still reek. You can use 1 carbon filter on the fan intake and one at the end of the ducting plus some air fresheners and ionic crap but your best bet is to find a stealth area to vent you operation. If you can vent somewhere below your house or deck with a long enough tube, you should be able to increase diameter and CFM. The more air you pass over your ladies, the less it's going to stink. And if you're a DIY kinda guy, you can dissect your ready made filters and fill with carbon from ebay. You can also make you own using pvc pipe and an outer chamber (like a bucket-sized wrap around screen with a rubbermaid cut out top and bottom). Carbon is the best and my plants seem to dislike ionic breeze machines. I think you could probably go super ghetto by stabbing holes in the last 10 inches of your duct, putting a giant tube sock over it and then filling that with carbon (fish tank isle at wal mart) or maybe even baking soda but I bet that could get dusty.

Gel air fresheners are ok too if you're just growing a single plant.