I have a size 8.5-9 foot (street shoes) (26 Mondo) with a wide forefoot, skinny heel, high instep, massive arch, and skinny thighs and ankles, and I usually run a 300-307 BSL. I've been sizing down a 25/25.5 and figured that these boots would do the trick.
The 25.5 size (25 shell) left less than a finger width (10mm wide Sharpie) when shell sizing, which left little wiggle room for the toes when kicking or the space taken up by custom insoles (in my judgement). The liner felt tight out of the shell (not molded) and in the shell there was more than a 'moderate' amount of pressure on my big toes. Good news, the boot volume was right where I felt it should have been and the cuff height was decent. Here's the cliche at work: it's always easier to make a small boot larger...etc, etc. While I prescribed to this when I raced, now that I spend long mornings or days touring, a little extra room in the toe box is a welcome relief and if the rest of the fit is right, it takes nothing away from ski control. That said, I decided to pass on these boots based on the fit for MY foot.
Side note: after comparing the overall build and features to the Scarpa Maestrale and Maestrale RS, I was much more impressed by the liner, walk/ski mechanism, and buckle placement and construction on the Scarpa boots. The BD *felt* (subjective) a little cheaper than the Scarpa's. Had the fit been right this wouldn't have stopped me from choosing the BD's but it did give me a moment of pause.
Four stars because I'm not going to moderately rate a boot I haven't actually skied.
Disclaimer: boot fitting is an art and there are more variables to getting the right fit than anyone would like to admit. This is an anecdotal, tried-on-in-the-house review. Take it with a grain of salt.