To be honest, I was holding out for the Bluray version of these films, but I found this boxset at Wal-Mart for $12.98. It such a good steal that I had to buy it. I picked up the only copy at my local Wal-Mart, so I'm assuming supplies are limited (or are selling really well).
There are no special features, but all four films contain the English audio tracks. The other neat feature is that they are in "slim" cases.
I've only seen two of these movies but I can tell you that the best of this bunch is EXECUTIONERS FROM SHAOLIN, featuring the classic Pai Mei character. Three Liu Chia-Liang and one Chang Cheh film, so the majority of these films learn towards "comedy kungfu".
NOTE: There are no numbers on the spine.