Depends on how much money you have and what your priorities are. My brother in law has one; he is at the ripe old age of 20 and thinks its hot stuff. I think it's mediocre at best. If you can pony up say $299, you can get yourself into the world of HSU, which will wipe the floor with anything KLH puts out. If you value the quality of bass over quantity, there are still better options than KLH. But, it is what it is.
Loudspeakers should be nothing more than a pass-through of information that was originally recorded by the artist or the re-recording mixers, to you, that's what It should be, it should play a roll in how it sounds, it should be accurate, and lots of loudspeakers do, as most loudspeakers have distortion, some to some degree and the louder you play them they all have more, there is the (quads) that sound fantastic but they too will give a distortion Patten.
The only way to determine if the speakers are good is if you listen to them. You can then judge the speakers by way of either you like the sound or not.
i am not downplaying construction, materials design and reputation of the manufacturer. In the end your ears will be the judge.
i have a klh 10" sub and it thumbs in my garage its almost a year old it dose hit real hard but has a belly type through to it and thats not somthing thats going to last they are cheep and will not last 10 or 15 years if you pay 80 or 100 $ for them its fine and will stay thumping for a year to 2 years ps the fuse will blow almost 2times a year