There is nothing better than these in the monitor category at this price point, period.
Folks... these are near field monitors. They are designed for one thing: to provide an accurate, unbiased, uncolored representation of your mix, when listening up close. They do that phenomenally.
A near-field monitor setup is designed to be listened to from a few feet away, with speakers at ear level. If you properly set them up and use them in this fashion, they SHINE.
If you're expecting an every-day-listener set of speakers out of these, you might be disappointed. No, they won't fill your room with wall shaking bass. Off-axis or at a distance, the highs will sound average. Point is - room setup, speaker placement, and your purpose most of all, is important. These are monitors. Their job is to be neutral. Most people are used to speakers that are anything but; exaggerated bass, rolled off highs... not here... we're talking FLAT response from as high as you can hear, down to about 40-45hz. (If anything, that's my only complaint; they reach down to about an "F" on a bass guitar; a low "E" is where they start to lack.) If you're looking for super-loud, bone crushing bass, colored exaggerated sound that you get out of consumer grade stereo equipment, spend your money on normal stereo speakers! You aren't ready for, or don't need these.
If you're looking for a neutral representation of your source material, and will be sitting a few feet from these (like on your desk) you'll be blown away. If you're looking for bumping beats for a house party, yeah you might be let down.
They do what they're supposed to do, very very well. Don't tell KRK but I would have been satisfied with these had I paid twice as much. I totally dig the "grown up" sound, that flat, un-colored response, when it comes to listening to music for fun - I'm hearing what the engineers heard when they put together their mix. And when I'm using them for "work" - making mixes of my own - they make life so easy. If my mix sounds good on these, it will sound good whether somebody is listening with headphones, a car stereo, or a hi-fi. That's the point of monitors - they're accurate, and they play the role of happy-medium, and these deliver, big time.
The fact that they don't put out excessive sound pressure, in my opinion, is a bonus. I work from my home-studio, it's a flat with downstairs neighbors. I can crank these to what I perceive as "loud" and mix and produce into the night, without bothering the folks downstairs.
As for the "sound" - the stereo imaging is what stands out; again it has to do with your setup and where in your room you place them, follow directions - but I digress, the sound stage is wide and full, we're not just talking "left" and "right" but we're talking distinctions between near and far and everything in between, a wide and deep soundsatage... there is plenty of "air" between different instruments; every detail and nuance is there, you'll discover things you never heard before in music you've listened to a thousand times. The highs reach into ranges probably only my dog can hear, but does so while still sounding warm and not shrill. The low-end lets you know its there, but again, it's not going to rattle your walls. They're 5" speakers. You will be taken aback by how much bass, and how low it accurately hits given the size, but if you're looking for sound pressure - no it ain't there; it's not supposed to be! Sound pressure is the job of the PA or hi-watt hi-fi. KRK sells an add-on subwoofer if you really need to feel your sound... and if loud is important, move up to the 8s (which I also have much experience on; phenomenal as well.) I don't find the SPL necessary for most mixing tasks... (perhaps if I were mixing movie soundtracks with sub-sonic sound effects... I'd want the sub...) But otherwise, with very little practice you'll be able to mix the low end properly, without over or under-estimating it, which is all too common a problem with lesser monitors. When we say they're flat to 40, that doesn't mean they disappear lower...
For what it's worth, I'm hooked up via balanced TRS, from a DigiDesign 002R, in a smallish room, approx 150 sq ft, with some sound treatment; and do most of my work in Logic... dealing with a variety of music styles from metal to hip-hop.
There's a reason you'll find KRK in high end studios world-wide... and you'll never find anything else in my vicinity from now on.
** Update: after steady use close to three years I had the amplifier for the woofer suddenly die in one of these. Turns out the warranty is for three years, so I was still in time - KRK support promptly issued an RMA, I shipped the speaker to them and they sent it back repaired, good as new. Took about 2 weeks turnaround but I used ground shipping on my end and it was also right around Christmas time. So despite that problem I stick to the five star review because KRK held up their end of the bargain and 3 years warranty is pretty generous so I'm still satisfied. Keep your receipt though - they might not be as accommodating if you don't have a copy of it!