How good of quality are the carbon filters on ebay???

Have been needing to buy a filter and trying to save some money. Are the cheeper filters on ebay any good?? Just wondering if any of you have bought them and your reviews. Maybe a pic of your set up would be nice. I'm using a vented 600 hps and will be buying a inline 6 inch fan to go with it. Im workin with about a 5 by 5 walk in closet right now. Any help would be great. Under $100 would be awesome. Here is a link to about what im looking at buying

http://www.ebay.com/itm/280771027435?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649#ht_3927wt_968

Has anyone bought a filter from gotham hydroponics? or any filter for around $100 on ebay and It works good???

im curious about this to

I bought one from gotham..... well two now actually but only used the 1st one. I vent through the filter then fan then out the house and it kills damn near 100% of the smell. On 2nd grow now and it seems to working just as good as day one.

you can make a good one yourself for cheaper just by going to home depot and the petstore.