If you have to ask that question, this site has done a great disservice to you.Is it every iPad model which is bent or just a limited amount?
Some iPad Pros have shown up with manufacturing defects, specifically bends or warps in the aluminum chassis. How many, we don’t know, but you can imagine how even a small percentage of bad units getting out could mean a few hundred unhappy people showing up here.
Mine was and is not bent, but if it was it would be returned. Apple has explained their tolerance for the flatness of the iPad Pros and certainly almost any photo you’ve seen here is beyond acceptable.
Buy the iPad Pro if you want one without too much worry. Just look it over as it comes out of the box, if anything isn’t right, it can be returned/exchanged.