I was about the 3rd person in the local store and have had a look at the whole range and to be honest was a bit underwhelmed. The thing that surprised me the most was how light it was and the actual size felt a lot smaller than I thought it would. To the extent that the 42mm may be a little too small for my wrist [reasonably big guy].
The Apple staff were amazing and very professional.
I got to spend about 10 minutes with the watches and basically my overall impression is this :
Anything except the sport watch is too expensive for what it is [basically a gadget]. I am an fashion, Apple and gadget person [probably the perfect target market] and I am a bit on the fence right now whether to get one or not [probably will as can't not get it

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As I say the sizing is great for medium to small wrists but I think it will look a bit odd on a larger mans wrist and mine is borderline.
The speed of it was fantastic, and is very fluid in operation. However the big question I had when playing with it is - What do I actually need this for.......
Also the premium materials used actually didn't feel as premium as I thought they would. Yes, it is a quality object but I was expecting more weight in the Apple Watch and the polishing of the steel actually cheapens it more for me, in a strange way. The Milanese strap with the Watch actually felt a bit tacky and was my top choice until I saw and experienced it.
Maybe I had higher expectations than I should have but I guess that is Apples fault for building this up for the last 6 months ! Anyway I am sure you guys will make up your own minds as this is a personal choice.
For me it is most likely the white Apple Watch Sport 42mm and buy a black strap.