I'd give it a third.... especially since I just bought one! //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
They have the same exact features...except you gain 7 watts with the 9815, which isn't important unless you actually use the internal amplifier...get whichever is cheaper or more aesthetically pleasing to you...