I've heard both good and bad comments about clone clubs. I saw a list of some of the better makes, but don't remember the website. My take (along with most everyone else's) is that every person reacts differently to each club make. With that being said, it would be a good idea to find a local pro-shop close to home where you can try out different brands and 'feel' how each brand reacts when you impact the ball.
This is a reply to your other post:
To try and stay under $500.00 - you could look for some 2004 Callaway Big Bertha Irons. The 06's are out now, so you can pick up the 04's for around $430.00 USD. If you can't find any local stores that have them instock, you can look at
Callaway Golf Pre-Owned & Outlet <- Fantastic quality secondhand clubs for a fraction of the price of brand new clubs.
Here is a link to some club reviews:
Iron Reviews but remember that it's best to look and touch before buying (at least in the world of golf)