I really enjoy my A2s. However, I would apply all the aforementioned caveats. They are definitely great only for there size and price; larger, more expensive speakers will obviously sound better. If cost and footprint were no object, I would have bought the A5 which are substantially better. I am extremely skeptical of JRGs claims, however, that anything under $200 are superior. I have not heard the specific speakers mentioned, but I have heard many worse than the A2 in their class but never any better. And perhaps my opinion of Behringer is misguided, but I just doubt they could do better for the same price (I do like that they have balanced inputs, though). Besides, those speakers are more than twice the size and weight.
Regarding improving the A2s performance:
I would echo the importance of speaker placement. Although this is true of all speakers and especially monitors, typically the smaller the drivers the more sensitive to direction they will be. The A2's are 2 and 3/4in.
With all due respect to Mr. Reina, they aren't particularly neutral. Esp, compared to the Yamaha HS80s or more expensive studio monitors. You can obviously mitigate this with EQ (I think someone linked to a thread on the subject). But I think if this is a high priority for you, then you might be better off looking elsewhere. As others have mentioned, most of the problems seem to be in the mid-base. Stands help a lot. I had mine on a stack of books for a long time and that mostly worked but the sand filled stands I made for them did make a difference. I also hooked up my sub from my main 2.1 system and found that helped. I set the crossover to 80, which is only cutting about 20 off the bottom, but I thought it made a big difference. This obviously doesn't effect the problem area directly, but maybe taking the load off such small drivers was enough. Unfortunately, I just can't justify dedicating a sub to them.
I thought my DAC made a huge difference. I typically use them with an Apogee Duet2, but I have tried them with a y1 and they both helped significantly. I prefer using the Duet for a lot of reasons, but one is that I found the the speakers sounded best with the amp volume turned all the way up regardless of the volume. It also seems to affect the the L/R balance.
I also second that the rca inputs are just better, but then again, perhaps my rca cable is just better. Either way I certainly wouldn't use the supplied 1/8in IC.
Sound aside and with a little dusting now and again, they are seriously sexy little speakers built with obvious quality. I will be keeping mine.