I bought both collections 1 & 2 a few months ago, had to, to be loyal to the series. So very glad I did.
There are 12 episodes on 2 discs, I know some would prefer that on 3 discs to up the quality, but the quality is just fine. The subtitles obviously arn't as pretty as fansubber's, but that seems to be the way with DVD releases. I am completely happy with the DVD's though, since I'm lucky/glad they released it at all. Need to get Kanon too... More Key please!!
Oh, theres no english dub, but I'm guessing most who've seen Clannad already won't want an english dub anyways, since usually dubs arn't fantastic. The lack of a dub didn't affect my choice to buy.
Little bit about the series for those who haven't seen it; tis based on one of Key's visual novel games, same as Kanon and Air, other anime based on Key games. Its a semi-fantasy romantic comedy drama I spose. Tis a lovely show, it'll make you cry like nobodies business... specially the second series, Clannad After Story, that was even more of a tear jerker...
My favourite girl is probably Fuuko Ibuko or Kotomi Ichinose. Though Nagisa Furukawa is darling. Okazaki is also super cute(he's one of the very few guys in the show lol, lead male).
The main females have their own arcs, Fuuko, Kotomi, Ryou/Kyou, Tomoyo and of course, Nagisa. Its a bitter sweet story I spose, since only one girl can get the guy, and they all(bar Fuuko) like Tomoya.
I would recommend this series to anyone, seriously, anyone, but not just anyone would watch it sadly. Even though its a masterpiece. Sad even the greatly awesome Japanese cartoons are underrated by most, the movies get the most recognition, if any.