On chrono24.com it said the glass is sapphire, probably not true!Wow, 2015, that's a ways out. I'll keep an eye on it to see if they made any other changes to it besides cosmetic. As it stands, I still feel the MM300 is a bit too thick for my liking, so unless they changed that I'll admire from afar.
I think the sbdx001 is almost perfect. The only thing I would love to change is dial, second hand, scratch resistant bezel and maybe a few tweaks to the bracelet to make it more solid. Pretty much a bit more GS details.
The movement is great(+5), my lens has not a single scratch and I banged the crap out of this watch for years. Also it looks amazing with the blue hue. Never understood the whole sapphire on the mm300 thing o| . No problems with the crown. Just don't clean the watch with soap ever! Had to replace the bezel gasket because of this. My own fault!