I'm a little late here, but..... I also have two of the 48's and as noted above they are a bit heavy and like to REV, so on the correct plane, they are awesome! I have one of mine in an old 70's pattern plane that was designed for a 60 ( Tony Bonnetti Troublemaker) and it's great.... the other WAS in, of all things, and Advance 40..... I had to add several ounces of tailweight to balance the plane and it flew "okay" with the above-noted 11-6.... overall I wasn't happy with "okay"..... one day I removed the 48 and put in an old ASP .40 which was several ounces lighter, removed the tailweight and put on an 11-5.... now it flies "great", the way it should !!!
