Please understand: There is no one right way to deadlift!!! A zillion (give or take) factors come to play. Just to mention a few: Leg length, torso length, arm length, hip width, personality and attitude. And maybe most importantly your ability to with stand the stress of max effort training - my personal weakness.
My opinion of what I saw: Text book perfect - if that book was written for you. My only recommendation is NOT to come to a complete stop between reps. I'm not saying drop or bounce the weight off of the floor. Just lower it under complete control and explode into subsequent reps.
By pausing you're doing defacto singles, which IMO will lead to overtraining your central nervous system.
Also the many (maybe majority) who say you need to lower your hips seem to suggest you should squat the weight up. I say you should PULL the weight up using your Hams, lower and upper back muscles to do it.
Example of me repping out for 5 recently:
http://tinypic.com/player.php?v=330w9it&s=5 That was my all time best quintuple at the age of 46.
Last DL day (23 APR 09) I did 655 x3 - a all time personal 3 rep record. It's a rarity that people my age with 20 years in the sport are able to improve. I'm not the only one - Louie Simmons comes to mind - but I'm one of the few.
I'm not saying my way is the only way - or even the best way. But it is the way I continue to improve despite my advancing age.
I'm NOT saying to disregard anyone else's methods or suggestions. I am hoping you'll keep an open mind and keep experimenting until you find the winning formula for your body, AND personality type. DON"T under estimate the importance of personality. I thrive off of lower reps in the DL (1 to 5), others feel better going with a higher rep range.
Good luck to the OP, and no offense to those who choose to train different than I.
Other examples of great deadlifters that shame me:
http://www.youtube.com/watch?v=3EuD-b3Ae4E This was my all time inspirational DL vid - until the cut off the soundtrack
But you will notice that none of these Super Stars of DLing keep their hips low - just sayin'
Out...