We discovered this by accident whilst wandering around the old town, but it was cheap, so we decided to take a look. It was fascinating, but guaranteed to make you feel uncomfortable.
There isn't that much to see, so it doesn't take too long to go around the whole place, so it is easy to fit into an afternoon exploring the old town. The pieces all have detailed descriptions of how and why they were used in the past, which were thankfully provided in English. Otherwise, it would have been difficult to know how some of the more bizarre instruments were used.
It is certainly not for the fainthearted, but preferable, in my book, to the snake museum next door.