STOMP TOKYO has reviews of both up now. Go to the site and click on "reviews by genre" and follow the links.
Those aren't necessary DVD reviews, although it may very well be that the Stomp Tokyo folks have a region-free player, and use it to watch imported Japanese DVDs ( very expensive if you can afford it). My local video store has subtitled VHS copies of many Japanese science fiction and fantasy films copied from the laserdiscs, some of them also retaining the original disc extras (for instance, the War of the Gargantuas tape includes comparisons between the Japanese and American versions, showing how the US distributors decided to alter the nocturnal battles of the creatures to make it look like they took place in broad daylight-a decision which, in my opinion, damaged their impact). It should be noted that only their Mysterians review offers an Amazon link to a VHS copy of the film ("out of stock"), and a DVD link for neither. This will at least be their first completely legal appearance on American DVD.