I just tried the Beethoven intro lesson for guitar -- first off, these are awesome for me as an almost-n00b guitar player!

Two suggestions:

- When you're holding really long notes the interval to see the next note is really small [the tab moves forward only once the long note ends so you don't have as much time to transition your fingers because you don't know/remember the next note; while in practice these should be the easiest transitions]

- Indicate the note lengths as well in terms of fourth or eighth notes, for those of us who like to count along.