I was excited to get the Mill Creek H-Man/Battle In Outer Space, but I've found after watching the subtitled Japanese cut, I wanted to check out the English dub and it wouldn't play. Very annoyed to find that part of the disc defective.
Did you have any problems with your copy in that respect?
I ended up buying two (don't ask) and played the English and Japanese versions of both movies on both buys and they worked fine.
Can't say the same about the Al Abramson set released by Severin, but that's another story.