It’s like they’ve updated it without really updating it, just fiddled around a bit - why change the crown, for example, necessary? “Seamaster 300” is nice I suppose, but improved movement?, by name perhaps. Not using a ceramic bezel insert seems an odd one. Also, not a fan of the protruding crystal, domed or not.
I guess one could argue what’s the point with similar on the speedy; stepped dial, DON etc. - I dunno, more nerdy and interesting on the Speedy? It doesn’t have the same effect on the SM300, to me at least.
Having said all this, a more tapered bracelet is definitely a plus - they just look better! That’s my only gripe with the current (now old?) model.
They were just my initial reactions, it’s interesting to see what others like/dislike and what they go for. We all have different tastes 😀