I only took a peek at classical lessons, so I can't say. But the rest of the lessons I've done are complete based on my experiences with music lessons. Music lessons tend to focus on brief examples meant to be studied and explored, sometimes leading to whole songs at the end of the lessons.

The song lessons? All complete, usually note for note, pick stroke to pick stroke deep, nothing missing thus far.

However, I do supplement songs not covered on GT with tab from Songsterr. They have lesson tabs too, but I haven't looked at those, there's enough lessons here to keep me busy for the rest of my life!