RamFX Drop In Filter

Anyone know what’s up with these drop in filters? http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33659&item=2414698809

Or how they might compare to a K&N drop in.

looks like regular foam to me. foam ones flow more but trap less dirt. just stick with a brand name like k&n.