Hireko has a special promotional 15% discount on their Acer XK irons till the end of April 2011.
I have bought their Dynacraft Prophet Tour Irons and the quality was good.
I bought a set of Acer XK Irons off of Ebay and it held up pretty well to my abusive swings.
They do have a 60 day guarantee if you buy their basic club without any customization. If you customized the club you will not be able to get your refund.
I would suggest you get a club fitting to get your stats and then go to their forum http://forum.hirekogolf.com/ .
You can post your club fitting stats in their "Ask Hireko" forum and Jeff Summit who is their very knowledgeable technical director will be able to answer your questions.