I took MoviPrep in later October for colonoscopy and it worked well. I sent in $20 Rebate from on November 1st - it said I would receive check in 4-6 weeks. After 12 weeks and several calls to the Rebate processor, I'm beginning to doubt that I will ever receive a check. They told me check was printed on Dec. 21st. How hard is it to put check in envelope and mail. I know USPS isn't that slow.