2 days ago (edited)
When I was in construction, my coworker bought one of these and it was awesome. When we brought it out, people did indeed think it was weird...for all of 3 seconds and then asked if we could make them a cup. At one point in turned into a game of "where is the weirdest place we can make coffee?". 35 feet in the air in warehouse joists, on a moving forklift, in the middle of a job site meeting, in traffic, etc.
Self control was the hardest part. We hadn't had unfettered access to coffee before and I ended up drinking so much that
I could see 3 days into the future and communicate with bees.
It also upped my cigarette consumption because waiting for a cup to brew was the best excuse for a 5 minute break. So I did the healthy thing and quit construction and cigarettes.
To really answer your question: Novelty. That's about it. I've also used regular plug-in cheapo coffee makers and they were way better but not as fun.