I really wish Crate Digger and Syncmaster would put their results on here! So, I tested at Quest with Quick Fix. temp was good at 98f and the product was fresh.
I waited, and waited. On the 10th day the Medical Review Officer (MCO) contacted me and asked what meds I am on. He said that although nothing was showing positive, there still was something amiss with the test. Although I knew there would be no bearing, I do happen to be on several medications and other OTC drugs. I listed them all to the Dr. (be careful, I have been told they can ask for prescript. numbers and double check). The Dr. said he would let the employer know the test was OK.
The employer contacted me 17 days after the test and asked what meds I was on because the test came back "inconclusive". After some ado, the employer has approved the drug screen- however this was very scary and a very long wait. I used quick fix in 06 and there were no problems.
I let Spectrum Labs (the manufacturer) know via e-mail that they need to get their lab folks up-to-date on what Quest is doing. Most other employers would ask for a re-test and could ask to be present when the donor is urinating...

Good Luck everyone