I remembered this series well from my youth, and was pleased to see it on DVD at a reasonable price, so I ordered both volumes. What did I find? The picture quality of these DVDs really is excellent: superb colour, very sharp images. Someone did a great job here. I don't know how it could be improved! Unfortunately, I didn't find that the storylines and characterizations held up all that well over the years. I have purchased many other old TV series, and certainly enjoyed watching them again so many years later (The Invaders, Original Outer Limits, Voyage to the Bottom of the Sea, Kojak, Mannix, Banacek, McCloud, Hawaii Five-O). In my view, however, this one just doesn't hold water, and as a result, I didn't find the series to be all that watchable. Some episodes were just tedious. As the "star", James Darren is generally annoying. Certainly, personal enjoyment of content is always a matter of opinion, and clearly, others have and will continue to have different views.
Five stars for picture quality, but my other observations reduce the overall rating to three stars. It's a disappointment. Not all journeys back in time are good ones, I suppose! If this series interests you, I would suggest that you start with Volume 1, and if you like it, then buy Volume 2.
Ultimately, I gave both sets to a friend of mine for his kids - aged 5 and 9 - to watch, and they love the shows. So, if it sparks an interest in history for children, then the purchase was worthwhile.