So I was one of the lucky (or fanatical few) to get mine on April 24th. Thoughts after ten days of using it are below:
I have the 42MM stainless steel with the Milanese loop band.
General thoughts: It's not an obvious gamechanger....but I think "smartwatches" or something like them, will be ubiquitous in five years. ten at the outside. you don't understand the necessity until you use it...for a while. It's convenience factor and time saving. pure and simple. I get all the notifications I want (and only the ones I want)...on my wrist. a slight tap on my wrist is all I feel, I move my wrist up and glance at it, the message or notification appears. I quickly look at it and move my wrist down and it disappears. it works in the middle of a meeting, in the middle of a conversation, etc. if I need to reply I can do that. my phone never leaves my pocket or other room...depending.
this review is closer to my thoughts than any I have read: http://www.businessi...h-review-2015-5
I have the large size. it's small. most other "smartwatches" look gargantuan next to it. they all look cheap. the 38MM is truly sleek. and definitely aimed at women. but it would definitely work as a more elegant size on a man. my band, the Milanese loop gets more comments than the watch itself. everyone loves the band...it opens and closes with a magnet so it's infinitely adjustable. the fit and finish of the stainless steel is definitely comparable to anything in the $1,000.00 and other watch market (mine cost about $750.00). that's why other smartwatches all look cheap. theyr'e $150-200 watches. duh. (the tech press doesn't understand this because they never wear watches (or suits) and because they think in terms of specs = price. jewelry/fashion is beyond them)
as a fitness tracker it's motivating. and will only get better. the heart rate sensors on the bottom are massive (Consumer Reports claims after testing it that it's the first accurate wrist-based sensor). apparently they are actually a plethysmograph (a pulse oximeter) but that feature hasn't been activated (Apple probably doesn't have FDA approval yet). anyway, the fitness apps work very well.
actually, all the Apple apps work very well. the third party apps almost all suck so far. Dark Sky, Uber, Evernote and Things (task management software that I sync between my phone and computer and watch) are the primary exceptions. that will change.
you note what this is? it's the first iPhone. much better designed and more capable than any of its erstwhile competition but a first-generation product in many respects. it was the 3GS that really sparked things for the iPhone. I imagine the third generation will be huge with the Apple Watch.
give it a year and you'll see much higher quality (and much more expensive) competing smartwatches...but right now they're all geeky and cheap looking and feeling in comparison.
the two greatest advantages of the Apple Watch? the "haptic engine" and Apple Pay. the "haptic engine" is those subtle little touches (forcepress and the digital crown are useful too) on your wrist. this is key to keep this as the subtle device it is. no one else can tell it's buzzing. and this is the device that Apple Pay was made for. if you have an iPhone 6 or 6+ you should be using Apple Pay whenever possible due to the tokenization (much more secure) but it's not really a timesaver, Apple's PR to the contrary. with the watch it really is faster. that's been the aha so far every time I've used it at the cash register. I pay my bill in half a second. stuns everyone. you just hold the watch up to the register and done.
and it looks nice enough that you can wear it with good clothes. happy to answer any questions.