Are these JDM AFC's any good?

I was wondering if these are worth the money. Do they actually work? I would like to get one but don’t want to shell out the money for an SAFC. http://cgi.ebay.com/ebaymotors/JDM-APEXI-AFC-AIR-FUEL-CONVERTER-safc_W0QQcmdZViewItemQQ_trksidZp1638Q2em118Q2el1247QQcategoryZ33597QQihZ006QQitemZ160224874954QQrdZ1QQsspagenameZWD1V

that thing is ridiculously old…

it doesnt even have adjustment for different rpm ranges…

for a couple more bucks you could just get a first gen SAFC… they go for around $100 - 150

still both are useless without a dyno tune so… and that cost $$ too