Is an active system worth the price of admission? In my opinion it is, but, just like with subwoofers, an active system is only as good as the integrating abilities of the person whom is implementing it. Going active makes the system more complex, not as complex as most people seem to think, but it is no longer plug and play. With an active system you are now the speaker designer, but instead of designing a speaker you are designing a merger between your speakers and your room, and you are already doing this if you are still using subs along with the miniDSP.
My recommendation, not that you asked for it, and assuming you only use your center speaker for movies and television viewing, would be to leave the passive crossover between your mids and tweeters in place for the time being and add a mid-bass cabinet to the left and right channels. I believe you will get more bang for your buck running active in the sub-bass to midrange region than you will running active from midrange to highs.
Having an active system is just another tool in the tool box in the never ending journey/battle of integrating your system and room into a single entity, and in my case enabled me to bring more life out of my system than I ever thought was possible.

