I'm going to disagree with the above comments.
I replaced a popular brand of portable
scooter (that required disassembly for transport) with a Luggie a number of years ago. Yes, it's quite a bit more expensive than a lot of other options, but it has been worth every penny.
It's one piece so no assembly/disassembly. You can partially collapse it flat (to put in the back of a car or front seat with ease) or fold it down to the footprint of a small carry on suitcase. My daughter calls it the Transformer.
Li-ion battery (on all but the least expensive model), so it only takes a couple hours to charge. Great range. Absolutely the best scooter for air travel - just drive down the jet way and the baggage guys take it below and have it waiting for you when you get off the plane. Tiller is totally adjustable - this allows you to drive right up to (and essentially under) most tables / seating areas if needed and there are low and high settings for the seat. Both armrests are easily removable (I rarely use both and sometimes none). I can also "park" it in far less space than a typical
ECV. When folded flat and stood up, it has the footprint of a typical folding chair and can easily be leaned up against a wall or rested in a very small space. Using an ECV on a cruise ship? Nothing beats a Luggie. No issue with those narrow hallways!
There are a couple potential downsides. Like many portable scooters, it's not a great choice for uneven terrain (greater risk of tipping). And it weighs 53-54 pounds. Since you can lever it into a car, the effective weight is significantly less. You can also roll it like a carry on bag (it has wheels specifically for this), though I dont understand the appeal of that feature - I'm going to ride it, not pull it.
Everywhere I go people ask about it and are just amazed at the engineering and how it folds down or into a suitcase footprint. I don't understand the "it's underpowered" comments. At full speed no one can keep up with me unless they are running. I haven't had any issues with stability or build quality.
I agree about the dealer network - few dealers have them so you are most likely buying it though one of the big mobility web sites. I haven't needed service, but it's handled though an 800 number where techs come to your home.
I am going to WDW later this year. I'm bringing the Luggie for travel, use at the resort and as a backup. I plan on renting a larger ECV with a suspension and more comfortable seat for spending hours at the parks, but I don't really have to.