I, too have a Hydra with Gearhead tunes, and I've had an F5 with DP tunes. I wrote my impressions in another thread awhile ago, if you want to search for it. The gist is that none of the tuners (persons or companies) are perfect, but each has compelling strengths, and I had good experiences with all the people. I will tell you that Matt may not be the fastest at making complex changes, but he will work like a farm animal to get it right, and it's hard not to be impressed with that.

Mark