Dine in only. It is good but I wouldn't make a reservation just for the bread. My daughter loves it to dunk in her cheddar cheese soup. We do tell our server to bring just pretzel bread and not bother with the other types.
One server very graciouslyl packed up a couple of extra sticks with butter, wrapped in foil for my daughter to take with her for breakfast. We were a very late reservation that night so I expect that they had extra that would be discarded but she got a nice tip anyhow. My daughter thought it was the best breakfast she'd ever had!
Never snagged a ressie for Le Cellier, so I haven't had it there. We do love it at the Biergarten though. They brought out several fresh batches while I was there last time. It was awesome. Much easier to get a ressie there anyway. lol
The breadsticks are okay, but I agree with an earlier poster-not good enough to warrant the choice of a ressie there. Now, the mushroom risotto in my opinion, is another story-I would eat there just for that.
You can only have it in Le Cellier however if you don't have a reservation and you still need that delish you can do a take out of the cheese soup and the pretzel bread. I learned this on the Dis, I wasn't even sure this was allowed until I tried it last December.