I have had several "lumpy" shakes. It really is hit or miss, but worth it for the non lumpy ones. I usually buy a few cases at a time, too, so I'm either stuck with lumpy ones or luck out with non lumpy.
I have cut back on them recently to try to use up some of my other packets, so I really only have one at work if I don't have time to come home for lunch.
Body Fat Percentage August 23, 2015: 48.8%
Current Body Fat Percentage: 48.3%