August Underground
 

I just won August Underground and Mordum on an ebay auction and am now awaiting delivery.

I'm very pleased at having acquired these titles and gather from reviews on IMDb that they're pretty challenging viewing. Has anyone else seen them and would care to comment?

I've seen Mordum. I would say that if you enjoy the Guinea Pig series or similar movies, you'd probably enjoy the August Underground movies, as they are quite similar. I'll be the first to admit that this type of movie is not my cup of tea, but your mileage may vary according to your preferences.