I stumbled across this movie by chance and after having watched it once, I immediately bought the DVD and it has proven to be one of the best buys I have ever made. First on the film: like all Bollywood (or even Hollywood) movies it requires some suspension of disbelief, but the core subject is very real: from what I could read, it's about how far one could lose/give up one's own self and turn into somebody else for a reason one considers to be of utmost importance. In Tanni's case it's to fulfill her late father's wish and to help herself put up with a reality which is the result of a personal devastation, and for her husband, it is to reverse Tanni's decision and let her be her old happy bubbly self again. There's also a somewhat Jekyll-and-Hyde dimension to Suri and his alter-ego Raj, as the latter gradually obscures the existence and value of Suri in the eyes of Tanni, although at the end Suri refuses to allow himself to be changed into another person to get Tanni's love. So ultimately the true self triumphs. And ultimately, of course, the film is also about what love really is --- that it goes beyond romantic thrills to entail self-sacrifices, respect and responsibilities.
The movie was beautifully filmed (kudos to the cinematographer), wonderfully acted (I was pleasantly surprised by Shahrukh Khan. His rendition of Suri was nuanced and very touching. The monologue right before the intermission almost moved me to tears), with amazing music and dance sequences that, unlike other Bollywood movies, feel completely natural and not gratuitous at all.
As for the DVD, the quality of picture was very high, and I am especially happy with the bonus disc which contains a lot of interviews (rather intellectual, which is a very nice surprise) and behind-the-scene materials. I also bought the soundtrack as I love the music of the movie very much. Although the quality is also good, I wish it could include other instrumental numbers in the disc as it only has six tracks.