I recently tried on a 15300 and it was borderline too big on my 6.5" wrist. I tried on the 15450 at an AD yesterday. They didn't have any SS models, so I tried on TT. It fit perfect on my wrist. It's wears like 39-40mm a Rolex sports model. Pretty close to a Daytona or Explorer I. The 15450 would be great in casual, dressy and sporty occasions due to its size. A very versatile timepiece!
That being said, I really want the blue dial, but it's boutique only and near impossible to get. The white/silver and grey dials seem easier to get.