I've never ordered eggs from Metzer, but I've ordered them from other BYCr's and on ebay. I've always had pretty good luck with hatch rates except this last time when I ordered goose eggs from a BYC auction. Goose eggs are harder tho.
I ordered 7 ducklings from Metzer last year and they all arrived happy and healthy! I haven't had to deal with customer service because I didn't have a single issue with the babies. Most of my ducks are from Holderread though so I notice a big difference between the lower quality of the grown...