I got the pleasure of dealing with a saleperson pushing the leo. "look at all the sparkle" she said. I asked about the symetry and h&a - "why pay for something you can't see" she said. I don't have a very trained eye, so to me every diamond has great sparkle/fire/bril...ect. But so would a piece of gravel under the 2.3 jigawatt lights they put in jewelry stores. Just kidding, I'm sure there is a difference, but to me, I just can't see the sparkle differences in the top quality diamonds (although I do not disagree one bit there is a difference). In fact, now that I got my diamond home, I'm wondering if they forgot to add the sparkle package, cause it just doesn't have the fire it did in the store. But I'll find out today, as I'm going to get wedding bands today, so I'll take it back in and have it cleaned, and admire it some more.
In summary, I would not buy a Leo. Not an expert, just a consumer that has been informed by this great website.