I have a Blichman 15, I use it as a latertun only, and 2, 20 gallon Blichman kettles for boilers. For a mash tun I use a tri-clad 15 gallon kettle from a restaurant supply house. I switched from kegs and perforated plate, only because I wanted to try out the slotted plate in the Blichman. Also, I'm attracted to shiny objects and ladies of questionable character. IMO the slotted plate is a little more efficient in the flow rate department and less prone to a stuck mash. The other thing that I like in the Blichman over a keg is that the Blichman has a larger surface area. I always have used a 26 pound grain bill and the grain bed is much less thick due to the extra surface area as compared to a keg. I was so use to the flow rate of the perforated plate in a keg, that it took me a few batches of beer to get used to the Blichman. I had to do the same thing when I first used a keg. In beer quality both systems are equal. The only thing I noticed. There is a difference in the flow rate/time when fly sparging and using a transfer pump, using the same grain bill in either system. Again, I like shiny objects, but that's how I roll.