I just uploaded 170mb worth of photos to mpix, took about an hour to upload them. Not to bad. No going throught the check out procces is taking forever. Is it wrong to have the print about 160 photos?
One thing I like better about winkflash than mpix is that you don't have to go to a seperate page to change the quantity of each size of photo. All changes can be made in the shopping cart and updated at Winkflash. I still only use mpx for their top-notch quality...
I just did the same thing with them. I use them for wedding and portrait prints. After the initial upload time, once you get used to the order process it goes pretty quickly.