This is an interesting film. Making a kung fu movie starring two genuinely physically handicapped individuals could have very easily degenerated into an exercise in exploitation. The Crippled Masters doesn't fall into that trap however; instead it serves as a sort of showcase for two men who overcame their disabilities and became talented martial artists. It's actually pretty inspiring.
I can't really say much about the DVD. The version I have is one of those public domain deals, and it's now seemingly out of print. Worth tracking down if you have the time and dedication.