I have a Corona and I'm happy with it. I have nothing to compare it to, though, since I'm new in the game and have only seven batches under my belt.
I batch sparge in a cooler with a bazooka screen.
On my last three batches I've had 83, 81 and 81% efficiency into the boiler.
It was less in the first brews but I can't blame that on the crush. I crush fine, lots of flour, and no stuck sparges or bad taste.
I tried to attach the drill last time I brewed, but I couldn't find the right size bolt in the garage. Anyone know the tread size?
beefeater