I've had mine about three days now. I thought the idea was stupid when it was announced, but recently had the money and one was in stock at the store near me - so I went to go try it on, and ended up purchasing it (the sport model, in black).
I guess I didn't follow it too closely, but - I didn't know you could take calls on it!
Also how well Siri works, was a surprise. I was looking up a hotels number yesterday, and my phone was across the room. I did the "hey Siri" thing, and told her to call the number - she did, and my wife and I were able to talk to the people at the hotel, right from the watch. I've also sent numerous text messages from it via Siri - it was fast, and surprisingly - Siri hasn't messed up once.
I'm a news junkie, and being able to have news apps on it is awesome.
Also driving directions appearing on it is nice, and being able to plug my phone into a stereo and control music from the watch, is very nice too.
I'm all together very impressed and happy with it.
I guess the weird thing is - it's not like a computer or phone where you use it daily - I've actually gone a whole day so far without using it.
I don't need a watch on my days off, when I'm just lounging around the house, or even taking a quick trip to the store. Or often even long trips. I don't care about the "fashion" of it, in fact I saw someone with it today (my exact model..) and thought it looked kind of goofy.
Anyway, in conclusion it's neat and I'm happy to own it, but I would only get one of the cheaper models for now. I tried a Microsoft edge prior to it - and the apple watch is leagues better.