Don't Read If You Don't Want Spoilers!
Extended Edition:
This is going to go deep in places and get a little critical, but overall I thought the added parts made the movie much better for the most part and much more cooler. The first added shots with Edmund complaining about going to the country did help establish the characters earlier by showing each of their tendencies before they went to Narnia. The spot where Edmund handed Lucy's toy to the boy sitting across from them kind of showed his mean-spirited mind at the time along with Lucy's perpetual kindness, but I felt like it slowed the beginning credits down.
The extended running from Macready scene was a nice addition, but the part where Peter says, "She's faster than she looks," was a little awkward for me since the Pevensies all laughed and then slowly resumed running again. This scene was one that I thought should have been put in the theatrical version. The extended scene of traveling to Mr. Tumnus' house and then to Beaversdam probably should have also been added, but time-saving is understandable since this part dragged the tiniest bit in a few places.
The extended White Witch's courtyard scene was great and expanded the mystery of how all of these statues came to be. Next when the plunder and search of the Beaver's house was added, I thought the transition between the original shot and the added ones was awkward, but it smoothed out somewhat before it got back to the original.
The added shots of spring coming back to Narnia were great making a good time lapse in between the waterfall scene and the Witch's arrival at the cliff along with showing some beautiful landscape. I really wish they had been put into the theatrical version, but they were probably cut to help move the picture along. Then when they went back to the White Witch, I had my biggest dissapointment. I honestly thought they were going to (and should have) added the part where Edmund sheds a tear, but who knows why it wasn't added? And then after Edmund is rescued, the added practicing bits were pretty good, especially the added sword-play between Edmund and Peter.
Now we get to my favorite part: the Battle. The added dogfight between the gryphons and harpies was awesome, the new shot replacing the old one of the gryphon swooping in to drop a stone was great, and the added shot of the rhino crashing into the minotaur and minoboar was NICE. Also, the new shots of some of the Witch's followers getting burned in the fire line and the big long shot of the Witch's army stopping their charge were great (Cutting out the burning shot was understandable, but not the long shot of the Witch's army). I thought the added Phoenix footage was all right. The CG image of Peter with a spear didn't look too great, but it worked, and his sword-play after throwing the spear was pretty cool.
Continuing the battle: The extended Oreius v. Otmin was great. At first I couldn't understand why Oreius throws his sword up in the air, but after watching it in slow motion I realized that Otmin was trying to grab it. That was pretty neat. And of course that, most unfortunately, ends the extra scenes and shots. In my opinion they should have shot a bit more of Peter v. the White Witch, but it's all right.
And now in closing: I know this has been long, but this is my overall view on the music re-looping. Knowing the soundtrack pretty much inside and out, I could always tell when when there would be an extra part added because I could hear the music suddenly jump back and repeat. At the beginning this didn't really go so well (regarding the soundtrack), but the White Witch's courtyard scene, the spring returning to Narnia scene, and the parts in the Battle were done really well and in at least one case hidden extremely well because of the sound effects. This is what really makes me wish that this extended editon was the theatrical edition, but some of the added CG shots might not have been completed at the time. Overall though, it was VERY enjoyable.