DVD or Blu-Ray? Well, the DVD seems the better choice: According to other reviews, the Blu-Ray version is totally awful with badly compressed video and a distorted widescreen frame that ruins the original 1.33:1 composition. But no one was complaining about the DVD version, so that is the one I bought, and I can confirm here that the DVD set is just fine. Video looks great, is in standard 1.33:1 ratio, the audio is nice and clean. The image is so clear, you can see a lot of the wires used to float objects around. But the bluescreen effects work fairly well, always did. The 4 DVDs offer a decent compression ratio for a crisp viewing experience.This was a lot of fun in 1975 and it still works now. Although some of the episodes are merely lukewarm, there are some standouts; and the series lasted only a short 12 episodes (one unbroadcast episode is included here for completists). I remember as a kid being bummed at its sudden cancellation back in the day, because seriously, it's a fun fantasy series, and David McCallum (as scientist Daniel Westin) makes a great invisible good guy. Melinda Fee is perkiness personified as Westin's charming and somewhat curvaceous wife. If you liked the old Universal feature "Invisible Agent" with Jon Hall, that is basically the kind of thing this is, an invisible man as James Bond-type spy with the ability to sneak into basically anywhere, rescue hostages, and stop the villains. He has a special rubber mask and gloves that allow him to pass as a normal person when he wants to, and which he then peels off when he wants to disappear. This gimmick is used in some clever ways, and there are a couple of priceless moments in which Westin peels off the mask and displays his invisibility to certain characters after swearing them to secrecy about "what he is about to reveal".You will see a lot of bellbottoms, evening suits, and moppy hairstyles, since this is the disco 70's, but as long as you know what you're getting into, you'll be okay. Enjoy!