I know this is quite an expense, but if you like making puff pastry, the fluted rolling pin is indispensable. I had the same question before I made my investment. And in spite of my reservation, I bought one and am glad I did. As you know, when you roll out puff pastry -- after about the 2nd turn -- the dough becomes rather hard to control. It wants to curve sharply to the right or left, when your objective is to keep a perfect rectangle. Well, leave it to the French to come up with such a design.
The flutes somehow continuously nudge the dough out in a perfect line. They also cause the butter to distribute itself evenly. Other rolling pins make your press the layers of dough an butter together. Uneven rolling will make the bouchee rise unevenly. Problem solved with this rolling pin.
Trust me, you will love it. And if you're like me, you may reserve a Saturday morning to make 4 or 5 batches which freeze marvelously and can be easily rolled out in the summer months. You couldn't make 5 batches with a regular rolling pin.
I wish you well and respect anyone who makes their own puff pastry.
Rick
P.S. If you are making puff pastry to encase a beef wellington, try using brioche dough instead. The bottom won't fall out.