I currently own a CQB Elite. I had a CQB before it. Wilson's are great guns but like any object with a lot of hand work the quality can vary from piece to piece. The good news is that if something isn't right Wilson will stand behind their work 100% including shipping costs both ways.
Here's some more advice that I hope helps you out. Don't buy direct from Wilson because you'll pay MSRP. Go through a discounting dealer such as George at
http://www.migunslingers.com as you will save several hundred bucks. You can shop the guns on Wilson's website and if you like one a dealer like George can order it for you and discount it too.
The Supergrade isn't worth the extra $1,800. They are no more accurate or reliable than any of their other guns. The extra cost of the Supergrade comes from the fact that only Wilson's senior gunsmith's are permitted to build them. BTW, there is a 3+ year wait for one too. When compared side by side to their other guns the main difference is that the tool marks on the Supergrade are fully removed from the
inside of the pistol. Most of the tool marks are removed from the inside of the CQB series guns. There have been threads on forums comparing Supergrades to non-Supergrades and in some cases the non-Supergrade was actually nicer. This goes back to what I said above that any hand made object can vary in quality.
Finally, don't get sucked into the 9mm 1911 craze. Wilson is pushing this heavily. 9mm 1911's can be very picky when it comes to ammo type. I know three guys that sold their Wilson 9mm 1911's because they couldn't get them to run 100% reliably. If you want an all steel 9mm handgun then buy a platform that was designed from the ground up to shoot 9mm like the Beretta 92 or the Browning High Power. Stick with 45 ACP when it comes to the 1911.