Everything I've ever read has said that True Flow is better than a K&N drop-in, honestly the only other drop-in reusable filter other than the True Flow I would suggest would be the Amsoil...but I personally guarantee the True Flow will blow both you, and the Amsoil away...very high quality product.
That video that THUNDR CLOUD posted in that link is a worthwhile few minutes...pretty impressive, often times at auto shows and some car parts expos there will be rep. from True Flow there and you can watch them do those demos, I have never seen them but, I have leared from first-hand experience the improvement a True Flow can make.
-Fink