I make my own plates but I got these to check whether my spores were clean or contaminated (since I wasn't sure if I was pouring wrong), and so far each plate have been consistently clean and sterile. I did lose two plates to contamination after a few days, but I think the spores themselves are contaminated so it's not on the plates themselves (they've contaminated my other agar plates too). However since my other spores seem to be happy on this agar, I can comfortably say that these are definitely clean sterile dishes.
Otherwise beautiful bubble-less pours with a nice thin layer so I can see through it. Some of them had a little condensation forming on the lids making it hard to see the growth inside, but so far it's been harmless to the mycelium so I can't complain. Great price and they were packaged neatly as well! They were incredibly helpful in confirming my suspicion that my spores weren't clean enough.