I have used, and suggest Doug Seven’s materials. For me, who uses an old Mac G5 with an outdated browser for online activity, the materials are available as CD-Rs.
I also like the old version of i-Tunes which has the long-deleted “cover browser” feature. I had this old version, and Apple took it upon themselves to change my program and “update” it without my consent. Now the cover browser is gone!
Actually, this is the reason I’ve not ordered any of Troy’s materials, because they are not hard copies like DVDs. I’d hate to pay for it then discover that I couldn’t access it. Plus, where I practice guitar is in my recording studio, where the computer is not on-line. If I had CD-R or DVD-R, I could take the discs into different rooms and use different (old) computers.
Even so, the Doug Seven’s teaching material is not “perfect” according to my criteria, since it does not specify left-hand (fretting hand) fingering, which I think is essential.
For example, on the Frank Gambale Speed Picking DVD, where he shows his pentatonic sequence, I had to do some “code cracking” of my own, and go through the video bit-by-bit, watching his hands to get the exact left hand fingering. At the speeds Gambale plays at, the correct fingering is essential.
I noticed that he would use different fingers on the same fret.
Also note this principle: that the ring finger (3) is the weakest finger, so sometimes a 1-2-4 stretch is preferable to a 1-3-4 stretch, even though it’s “out of position” in terms of the 4-fret span model of ‘one finger per fret.’ This is the way bass players play, and the way Chuck Berry played his famous rock rhythm.
If anybody wants the exact Gambale fingering, let me know.