The only thing that gets me about it, and I don't know if this holds up (would love someone to break it down for me), it that it seems like sometimes we have the defense on their heels in the hurry up, and then we come up to the line and give them time to recover a little by looking to the sidelines. It is purely a rhythm thing from my perspective, and again if I am wrong I would love to be told why.
Defense would still be on their heels. Purpose of the no-huddle is to prevent the defense from making substitutions, not necessarily to run plays quickly.
No-huddle offense doesn't always equal hurry up offense.
Also....no-huddle and hurry up are not necessarily the same thing. Plenty of teams run a no-huddle offense that doesn't necessarily run plays quickly. They simply just run a no-huddle to keep the D from making subs