I'll say it. Every one of the modern Martin ukes I've personally played have been a mess. Sloppy construction, no tone, heavy, and over-priced. And I'm a Martin guitar fan.
In my experience, there is not a large production guitar maker of note that makes a new production uke worth a damn. Fender, Ibanez, Washburn (Oscar Schmidt), Ovation, Martin, etc... All below expectations. While some are better than others, none of them come close to the big uke makers in quality, tone, and playability.
There are a few exceptions - Loprinzi for example. They make a damn fine uke, but they are hardly a "large manufacturer".
For less than the price of that Martin, one of the K's - or something like a Loprinzi production uke will be far better quality and tone. Even better, $1400 - $2000 can get you pretty close to a fine custom from one of our very own members. Martin doenst need your cash. A small luthier absolutley does.