Apple Watch shipping dates began to slip in under 10 minutes of pre-orders going live. Either 1) demand is huge 2) supply is really low 3)Apple is being ultra conservative in their shipping estimates to lower expectations. My guess is that it's a combination of the above. I think Apple was working down the the wire on getting this product as perfect as they could before they went to manufacturing. It was likely late out the door and they're trying to catch up to their promised launch window. It will be interesting to see how many of these pop up "in the wild" over the next couple of months. I've been an iPhone owner since 2009 with the iPhone 3G, and never have I witnessed a real life adoption rate as high as the iPhone 6. Typically as an "early adopter" of these things, I would have the product a good 6 months before I saw other people with them on a regular basis. With the iPhone 6, I saw them everywhere by Christmas. Since we already know that Apple is unlikely to release specific sales numbers on the Watch (as it's going to be filed under "other"), real world anecdotal evidence and metrics from developers are likely to be the best way to track the popularity of the Apple Watch.