This is another subject that has various studies and opinions. I elevate my dogs' bowls a few inches, just because they're large dogs and it seems to be easier on their necks and backs not to have to bend down so far. It also holds the bowls in place. They'd be all over the house otherwise.
What's more important for dogs who are prone to bloat is that they are not exercised real hard within 2 hours before or 3 hours after eating.
Oh, I use cinderblocks for now. They hold the stainless steel bowls perfectly. I want to build a stand for them, but haven't gotten around to it.
Agree with FOUR I dont see a real need unless the breed is prone to bloat, torsion or is arthritic and cannot reach down comfortably to eat.
i'm shopping for a raised feeder myself... considering building my own.