

I have one. I want to say ThinkGeek used to sell them, but I definitely recognize that backing as being from the same device I have.
It’s cool and fun to wear, but not amazing as a Bluetooth device. Microphone didn’t pick up super-well, which isn’t too surprising when it’s clipped on your shirt. Magnet would sometimes slip off if the shirt bunched up or something too. (I haven’t used it in a few years, so I’m a little hazy on some of this.)
A Bluetooth version of the TMP communicators might have better success, albeit at the cost of having to hold your arm up for the whole conversation.
I’ve been doing a rewatch and making notes of things that are referenced later. Considering most classic Trek has a reputation for being episodic, you’d be surprised just how much gets referenced later, whether in a passing comment or an in-joke or something. The only episodes of TNG season 1 where I didn’t spot at least a passing reference later was “Too Short a Season”, “Home Soil”, and “When the Bough Breaks”. (The references to a few of the others are vague and/or arguable though, and admittedly “Knowing where that clip in ‘Shades of Gray’ is from” qualifies a few of them.)
So it kind of depends on how strictly you define “important.” Most people could probably skip almost the entirety of TNG season 1 and not be that confused, but for example:
I could add other subtler things, but those are some of the bigger ones just from that highly-episodic season.