I don't know about everyone else, but I've stopped using the www.2test.com
registration for Prometric testing. I register the "same-day" at the test center. I only became aware of this after it was recommended by the test center staff.
Basically, I walk into the test center, whatever time they're open and request a test. They logon to Prometric register me, take my VISA card # and download the test. It takes all of about two minutes. I'm taking the test within 5 minutes of entering the test center. I log on to www.2test.com
after I'm done just to make sure I'm in the system and it has never failed. Note, I have received several certifications in this manner.
NOTE: This assumes the test center has room for you. The one local test center I use, WashTech in Tysons Corner, VA never has more than one or two testers and there must be 10 test stations. So BEWARE. Of course, I think there are 10 test centers in Tysons Corner alone if I ever had a problem.