While not a rail flat playing speaker, The Micca's are solid performers for the price point. Though it seems that that price point keeps creeping up with their popularity. At between $70-$90 I think these are good options. But if the Micca's ever get back into the $100 range (they are $94.12 with Amazon Prime as of this writing), as they did when the apparent switch to the MK III happened, I think people will be better served by going to the $120+ range of the Pioneers and Infinity's.
Here is the resent price history of the Micca's
I was pleasantly surprised that the Micca's lived up to the hype they have enjoyed the last year or so. If you already have them, I wouldn't upgrade unless you were looking to spend $150 or more, or you needed something bigger/louder.
If you are still deciding on what you want, then overall the Primus p143 is a flatter playing and measuring speaker and much better built. But the Primus also cost about 50% more unless on a deep sale.
The Midrange driver (BLUE) does a pretty solid job, There is a little bit of elevation and jaggedness from 1-1.5khz; which doesn't seem to be too offensive in the close mic measurements but does appear to grow a bit in amplitude in the 1m measurements. This rough patch is followed by a sharp drop followed by a slow roll off.
It looks like drivers are crossed over at 3khz, and the tweeter does a good job of being pretty flat with the grill removed (PURPLE).
Overlaying the 1m outdoor and gated measurements (should be accurate to ~600hz) with the close mic measurements. Shows smooth broad hump from about 700hz-2khz, with it's peak matching the roughness out of the woofer, and some of the port noise, though I think that is coincidence. That hump falls back down a bit, at the same point where the woofer has it's notch, and then another bit of a peak at the cross over point. The woofer seems to be pretty capable on the low end, but I think that issues that to exist are related to the woofers upper end response.
Micca MB42x MK III 1m Horizontal axis measurement
The Micca's do a pretty solid job at maintaining good dispersion out to 30 degrees off axis