Flip tops are cool, but I would never bottle all my beer in them. First, they are more expensive to acquire. Second, I felt weird about giving them away because some people would just never return the bottles. With regular 12oz bottles, I could care less if they returned it.
I do like them if you keg and you are filling up a few bottles off the kegs...because the already-carbed beer foams a little, it's quicker to just flip the top. So for this reason, I like having a few flip tops around.