I asked a VERY simular question last night. Snowman sent me a link to a web artical that really had great things to say about the 0039 cam. Just look down the posts a few and its there. The Hotbike web page said the setup was a winner. I have a set of keyed 0039's that I decided not to run but to instead have custom cams ground using the 0039 as a base pattern for. Just stretching the duration out slightly to a 242 instead of the 236 (want less noise) and shortening the exh duration slightly with less to a 252 and a .550 lift rather than the .580 the 0039's have. Its kind of hard to get feedback on the HQ 0039's, don't think many are running them but I will let you know as I will begin putting my 02 Ultra back together this week (waiting on cams) and my set up is very close to the Hotbike tech report setup they did....we will see.