I have a Quest, and it is a ton of fun. It isn't quite the future of transportation, but it has several strong things going for it. It is very very fast. You breeze past the strongest riders. People get very excited and want to see it and sit in it and take photos of it. It is really good in the rain. It is great in a headwind, but a bit exciting in a crosswind. It is great in cold weather, and a bit warm in hot weather, but never bad. It is great in the flats, but it is a bit of a slug uphill. It isn't as bad as some people make it out to be on uphills. Downhills are speed limited only by your tolerance for terror and the quality of your life insurance policy.
On the downside, it is very low and it can be invisible if you are at the side or directly behind a car. It needs to be positioned with care. This is somewhat mitigated by its speed, which lets you keep up with the flow of traffic in many situations. It is awkward around town. It has a huge turning radius, it can't jump curbs, it can't fit between chicane gates or tight bollards. It is delicate and someone can easily damage it by pressing hard in the wrong place. You can't just hop on and off as fast as you can with a bicycle, but it is easy to pull it and walk it down the sidewalk if required. It also needs to be tailored to the rider, so you can't just try one out. Oh, and if you need to do any work on it, it can be an ordeal. It is much more difficult to do some types of work on it because of the shell.
It is fantastically expensive for a bicycle, but less expensive than many other recreational vehicles you might buy. I love it for my commute. It cuts 75 minutes to 50 minutes. I use different bicycles for different things, but if I am going flat and straight and far, the Quest is unbeatable. Clonking around town, I use a 3 speed. Dicing through the city, I use a Spot 11 spd. For hauling groceries and kids, I use a Yuba Mundo. The future of transportation depends on what you do and what your budget is.
Obviously you need to get one.