Bought for the engagement with my current wife the balloons. Although the balloons look very nice, but at least half of the balloon has already burst during inflation. I gave up after 20 inflated (and 25 burst) balloons, because I have them blown up by mouth and the face was quite red, because a flick rubber scraps in the face when one again burst during inflation (doing quite hurt).
My conclusion: the balloons look very nice, but you should not inflate by mouth. Maybe it's with an air pump or a special Aufblashilfe better, but from our own painful experience, there are only 3 stars from me.