Decent Value but won't work for pro mixing
These monitors are not bad for the price range. But, even in a treated room, they lack the depth and detail to give you the tools to make a great mix. I have these in my home studio but take my mixes to a friend's studio to mix/master them. I'll often do a pre-mix at home before I switch over to the other studio to finish it off. There are so many little things I have to change on my pre-mix once I get the session on better monitors (the studio has Dynaudio BM 15's). Now, I completely understand that it is unfair to compare these inexpensive KRK's to high-end Dynaudios, but at the same time, nice monitors do make all the shortcomings of the Rokit 6 all the more apparent. The low end is a bit flabby and the midrange is pretty undefined. The high end is also really difficult to nail down right at the crossover frequency with the tweeter. I find myself making my mixes overly bright in an attempt to clean up muddy midrange frequencies, only to tone down a lot of those EQ decisions when I get them in front of nice monitors. Similarly, the monitors do not have much depth to them, making things like Reverb/Delay sends difficult to judge.
Now that I've gotten used to some of the idiosyncrasies of the KRK's, I can make pretty decent mixes with them, but even then I'm fighting against their shortcomings so much that it takes way longer than it should to finish a mix. While they're not bad for a first set of monitors, if you are serious about making commercially viable music at home, it is absolutely worth it to save up and enter the monitor market at the midrange area (Yamaha HSM80's, Dynaudio BM5a's, etc.). Otherwise, you'll be like me and make life harder on yourself while taking anything you want to sound fully professional somewhere else to finish off.