A little insight on forgestar, they sell cast rims, not forged. Their company name is very misleading. Looking at the picture it shows a forged wheel, what you received is a cast wheel. (Dead giveaway is the fat spokes that bow out to stick out past the wheel). Cast wheel makers do this because cast iron is not strong enough to have thin narrow spokes, it will crack or even disintegrate at highway speeds. Which is why you received what you got.
Secondly, I considered their rims for my E46 but did some research and found a ton of bad reviews on their products. I mean A TON. Everything from cracked wheels, to vibrating wheels (due to poor craftsmanship, not balancing!), to wheels of the wrong offset, size, and finish. The owners that did receive reasonable appearing wheels, did notice that the faces of the rims did erode prematurely. Not trying to rub it in your face at all but I call your CC company you made the payment with and have it as an unauthorized transaction. Mention, you purchased A, you got B and the seller is really trying to swindle you out of your money by not offering a refund. Those wheels look like $400 wheels tops. The powdercoating was probably more expensive than the actual wheels. Go with a brand you trust!
Here are some links I just dug up really quick for your ammo. Sorry to see you guys go through this.
http://www.myg37.com/forums/wheels-a...forgestar.html
http://forums.5series.net/e60-parts-...-wheels-99166/
http://my350z.com/forum/wheels-and-t...14-beware.html