I was concerned about this strap's ability to stay in place before receiving it, visually it doesn't look looks like he's very safe. But the grip (no pun intended) is actually pretty solid considering there's no locking or serrations. It lies flat, but I'd recommend not going a size larger than you absolutely need because when tightening it can be difficult to slide the tip of the strap under the overlap if you have too much left over. if it makes sense And yes, it does lie flat, but I don't think the protruding buckle has been a problem for me on other harnesses, so I can't comment on that.
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