I am not sure about this, but I think these pagodas are not very popular among tourists. At least I did not find any foreigner while here.
As always, you will be approached by locals trying to sell you some souvenirs. I really liked these wooden dragonflies. I did not buy any, though. I thought they were too fragile. I still had many cities to visit after Hanoi. I was afraid they would get broken in my bag. My Vietnamese friend bought twenty. They were so cheap!