D-Fins have their place for the right rider, looking for the right feeling. But they are definately not recommended for the uninitiated. I have one and love the feeling on the right wave for nose riding only. Thats all they do well, is nose ride, and the board has to be tuned well to the fin, and not many shapers know how to do that. Most days mine only works OK, but those days where you are speeding down the line, purched high in the pocket and expecting the tail to break out, and it doesn't, It really doesn't get much better than that. There are far more forgiving nose riders made, and I would recommend something different for someone learning the ropes of logging. Like it is said above, for your first log, I would recommend something with a box, so you can experiment with fins and find what you like. Logging is all about cross-stepping, nose-riding, and doing drop knee's, if you want to turn, don't get a log. I either ride a shortboard, or a log, nothing in between works for me. When I get on a mid-length, I expect it to turn and pivot like my 5'6, and it doesn't. Too much milking and patience for me. It took a long time to learn to shortboard and logg on the same day, without it screwing up my shortboarding for a month. Don't think I could ever put the time in to learn a mid-length, at least the way I see myself wanting to ride it. Everyone has thier own opinion of what works for them, experiment and find what gives you the most fun. Just adding a bigger board to your quiver is going to exponentially increase your fun time.