I've had my Tikit for a month now, and it has replaced my fixed-gear as my daily commute from Brooklyn to Manhattan. I know folks with Bromptons, which are beautiful bikes as well. To generalize their respective merits, I'd say that if you are an aggressive rider, go fast, hop curbs, barrel down poorly surfaced roads, then you'll love the Tikit. If you ride like a good citizen, and want your bike to be welcomed like a good citizen inside stores, restaurants and trains, you might like the Brompton. There are places where I get nervous looks from a proprietor, even with the Tikit covered up in French Horn mode. But mostly people just think it looks cool.
I've also taken the Tikit on a business trip in the Samsonite F'Lite, and it made a huge difference in enjoying my off-time. Anyway it's my first folder and has been a blast to ride. For those on the fence about investing in a quality one, I say it's well worth it.