2 in one valves?

Edited: 3/3/2004 8:10:01 PM by oldschool

has anybody heard anything good or bad about these, run them or plan on it? just found them on ebay and it seems like a good deal for the price.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2462924042&category=33586