Fourth pair of Shimano shoes and I stick with this brand as my foot is wide, but not so wide as to buy a specific wide-sized shoe. I've found Shimano shoes leave a little more room in the toebox and work really well for me. The RP9 is a step up from my last pair but the materials in the upper seem to sacrifice comfort for weight as they just don't feel that good to wear. I've probably ridden them 500 miles now, and they are better than the start, but fully broken in I still don't love them.
I do like the Boa closure and the outsole is definitely stiff, but the upper materials are thin and just not that flexible.
I'm pretty picky with shoes, and these are pretty solid. I really appreciate the extra toe box room and comfort for what otherwise feels and performs like a top-shelf racing shoe. The downsides are that they're a little pricey for a single-Boa shoe, and that the dial's positioning initially places pressure on the top of your foot (this goes away once broken in, but it was almost a dealbreaker initially).
Light weight shoe with great materials and flawless workmanship. I really like the sleek styling. The fastening system is quick and easy to use, providing an excellent customizable fit. Sizing is true. I'm a US size 12 and fit well into the EU 47. Cleat mounting was super-simple. The shoe overall is not as well-vented as others I've worn. It's great on cool mornings, but when the temperature gets into the 80's, my dogs are toasted. If your feet run cold, this is a great choice. If you cycle in warm climates, maybe not so much.