Just finished up brewing my kolsch. Decided to try the No-Sparge method discussed in a recent BYO mag. Everything went great, though I anticipated 55% eff and got 65%. It worked out though, as I had less boil-off than usual and ended with 6g vs my usual 5.5g, so my OG was only 1 point off. It was the first time I actually brewed IN my garage, instead of outside, so that must have affected the boil off rate. I could have boiled it down further, but figured since I was near my OG at 6g may as well stick with it. One thing I learned: I won't be able to do anything larger than a 1.050 beer in my 10g Igloo cooler with this method. It was literally filled to the rim with all the grains/water added.