There are quite neat. BUT, after playing with them a bit, I have removed both from my Apple Watch. The problem is twofold, both relating to the small screen size of the watch.
First, it is very difficult to use them effectively on the watch. For MS, there is no way to enter text effectively, so really I am just looking at MS scripts on my iPhone. Pretty, but not much utility. For AMS, while I can use voice input, I rarely am in position to do so. (meaning voice is inconvenient at that time).
Second, the Apple watch screen is very precious real estate. So any apps that I don't find really using, I remove from my watch to free up space for the app list. Since neither of these are terribly useful to me on my watch (as opposed to the iPhone, iPad, and iMac), I have removed them. I have a calculator on my watch that is more then enough for me if I need a quick calculation and do not want to ask Siri. Even it is there on probation.
If you were's to cease supporting them the watch I would shed a small tear, (they are neat!) but I will not really miss them in passing.