I don't think it's worth it, personally. It's kind of cool to be able to start (or lock/unlock) your truck from anywhere, via your phone, but I've used it all of once in the year or so I've owned my truck. And that was really only to show a buddy how it worked, from the ice while ice fishing.
I've just started getting the e-mails about paying for it, and I think I'll pass. If you worked in an office or something, I could see it making a bit of sense regarding the remote start. But it's not cheap, and in my case, something that isn't used enough to warrant the coin. Especially since I can almost always hit my truck with the remote, when needed.
That said there may be other features on UCONNECT 5 that make it more valuable, or individual use cases as mentioned, for others to want to have it.