Accuracy of nearfields has a lot to do with the room they are in. What might be bass heavy in one room might be different in another, Another issue is placement... free standing, by a wall, in a corner, wherever.
Get the Mackies away from walls, and they tighten up a lot in the bass, plus they have a degree of tone control on the boxes. Yes, I've heard people set them up very bassy, for hip hop production (and at least you don't need a sub, with all IT'S problems at moderate levels), but they can be dialed in quite well... Like I said, no translation problems to our B&W's, so far

The main thing about them is they are hooked to my computer, my keyboards, everything I listen to. Whatever small amount of color they may have, I get used to listening to everything through them, so I am very aware of what a well mixed and mastered sound SHOULD sound like on these speakers.
You CAN pay a lot more, but these, IMO are at the bottom end of a diminishing returns scenario. You have to pay a LOT more money for anything discernibly better, but they sound, at least to my ears, a LOT better than anything else any cheaper, and better than most at the same price range, IMO. They were a HUGE improvement over my Event 20/20bas's, which I used prior to these.
But make sure you pay VERY careful attention to placement... rearrange your room if you have to! You put ANY nearfield in the wrong place, no matter what the cost, and you create all kinds of problems.