Yes, absolutely. These are the exact same as the original, "giant" sets as far as the dvds and content go. The only differences are that they don't take up a ton of real estate on your mantel and that these are missing much of the "artwork" that is printed on all of that wasted cardboard from the originals. If you only love the series and aren't a super fanboy you would be fine with the slim sets. They actually are easier to maintain, as well, as the old clunky gigantic sets have dvd holders that constantly break and fall apart after repeated uses.
(Holy crap, just realized this question was from... 2007!?!! I feel like an archaeologist of Discussions now for stumbling upon this.)