Went in mid-October to the Jinshanling Great Wall. I didn't get to any of the other sections so I can't compare it, but for the vast majority of the four hour hike we had the wall to ourselves with not a person in sight (we arrived pretty early). There are both restored sections and unrestored sections of the wall here which is really nice. I went on the standard issue backpacker bus which gave us four hours to tour the wall before the return trip. It was just barely enough, and It probably would have been worth it to just rent a taxi or go by local transport to have the extra time flexibility.
There are locals at the wall that will try to sell you postcards / sodas etc. If you try to ignore them, they will just follow you along the wall in the hopes that you might buy something "later". If you'd prefer for them to not follow you around, take a minute or two and look at what they're selling. If they don't have anything you want, politely say so and ask to be left alone. You may have to repeat this with a few people... It worked for us though.
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