Mini DisplayPort to Dual Link DVI Adapters: Arriving but buggy!

Earlier today, we were reporting that Apple Mini DisplayPort to Dual Link DVI adaptor was further delayed by Apple. According to one of our readers, Ron, some samples made it to users, but were quickly identified as not being really functional:

The Apple Mini DisplayPort to Dual Link DVI adapters finally started arriving--over two months since their introduction. These allow you to run a 30" monitor with the new MacBook Pros.
After waiting this long, however, they cause the mouse cursor to jump while tracking. This has been confirmed with wired and wireless mice, and with two different adapters.
Not only did Apple charge us 100 USD to use our Cinema Displays and make us wait over two months, but they don't even work. Ridiculous.
Here's a link to the small (but growing) thread on Apple's Discussion Forum: http://discussions.apple.com/thread.jspa?threadID=1830794&tstart=0

Apple is really loosing ground for some of its quality control procedures, it is time to wake up and stop out-sourcing to non-reliable companies! first, it is rather outrageous to charge so much money for just an adaptor, second it makes no sense to ship units not fully tested. One can now further understand why Apple decided to open the market for adaptor to third-parties (see previous news). Overall, this problem could explain our first news today on this topic, Apple might have postponed pending shipments till the product is fully functional, to avoid having to exchange too many units.