Both features in conjunction make the device a far more personal user experience. Force touch is a twist on pressure sensitive input; in this case, the screen can discern how hard you are pressing in order to perform some action. For this watch, a harder push results in bringing up customization abilities. It’s obvious this functionality will one day move up to the iPhone (once the costs can come down to building larger displays with this technology).
The Taptic Engine though (which provides haptic feedback) is what takes the user experience to a far more personal level. Through a combination of hardware and hardware, one can experience an actual physical feedback in the form of subtle vibrations that only the wearer can feel/hear. A feature like this obviously has to be tempered so that it isn’t obnoxious or outright gimmicky. Apple kept their applications fairly simple but 3rd party apps will probably change this. Again, this isn’t the first device to do this (virtual reality has utilized haptic feedback and I’ve seen some even more wacky/outrageous use of haptic feedback when it comes to virtual experiences).
I also took a quick look around the tech blogsphere. Reactions are unsurprisingly mixed. I see the same sort of skepticism that existed with the FIRST iPhone and the FIRST iPad when it comes to the technology angle. Something like a watch is in different territory though. There’s the aesthetic design part. Just from seeing it in pictures, it’s a premium design. High end watches also feel good when holding it (the feel of the metal as well as it’s weight). Finally, actually wearing it on your wrist and how it feels overall. These are all very personal experiences.
What’s also interesting is that with the proliferation of smart phones, many have been eschewing an actual wrist watch because their phone, is their watch. Whether or not the Apple Watch along with other smart watches like the Moto 360 and Gear S can reverse that trend, remains to be seen.