QUOTE(oisinn @ Oct 18 2011, 10:48 AM)

so verbatim mkm001 are the preferred discs while verbatim mkm003 are not as good. And you say that you can tell the difference in ImgBurn!! But that's AFTER you've bought them! How can you tell which is which before buying so you can get the right ones?

I don't know why you think that MKM-001 are preferred. Did c4eva say that or something?
It may vary depending on your burner, but I've found MKM-003 discs have given better results in Opti Drive Control scans although both disc types have error rates that are low enough that it's not an issue. I accidentally burned an MKM-003 at 10X the other day and the burn quality was still good.
Also as mentioned above, MKM-001 are rated 2.4X while MKM-003 are rated at 8X, so that's an easy way to tell what you're getting.
QUOTE
This is also waaaaaaaaaaaay cheaper than going down the Xkey route too
It's not in the long term. You don't need to buy any discs with the xk3y so your initial outlay is all you have to spend. A 25 pack of Verbatim discs costs £20 which is an ongoing thing and you're gonna be reburning loads of discs (comparatively, compared to XGD2) when dashboard updates roll around considering all XGD3 games have AP2.5.