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While any joint fixes made with MLPro work perfectly in Studio, they are seriously lacking when you load the figure into Poser.

Never had any problem with exported CR2s in Poser (versions 7, 8, and 2010--haven't used it with earlier versions.)  I know Will Dupre and Littlefox also use it to create Poser content.

MLPro is part the DAZ Advanced Figure Setup Tools bundle.  It lists around $180, Platinum members pick it up for less than $125, and it goes on sale from time to time.   (I remember paying around $80.)   There is a lot more in the bundle than MLPro. 
http://www.daz3d.com/i/3d-models/-/figure-setup-tools?item=8115&_m=d

Allegedly DAZ built this to handle both their DS and Poser content.

If you thinking about price, CC, I'd aim at the $29.95 range--maybe higher if you add automatic ECM slaving.   (When you're loading 10 parts that need to morph in response to a correction morph, Poser's slaving tools are a little light.)

Another price point to evaluate is something like Easy Pose (which creates chains of slaves for things like tails, ropes, and well . . . chains)   Easy Pose Pro (available through RDNA) runs about $70.   (No link right now, RDNA is off line.)   A competing product from PhilC, which just does the the chains called "All Tied Up" runs $25.  http://istore.mikrotec.com/philc/index1.html?page=catalog&category=a&vid=150613493&pid=811602505&oldvid=2143420604

YMMV,
-K