I like the Federal bulk packs. The Remington aren't bad either. No complaints with either and I've run about 1,500 of them through over half dozen different shotguns over the last couple of years.
The Winchester ones, on the other hand, are complete and utter crap. They don't pattern worth a damn and some of them aren't even assembled properly. We actually found that if you loaded a gun with shells randomly selected from all three brands, 9/10 times you'd miss clays with the Winchester where you'd hit it 8/10 times or so with the other brands.