Hey Matt,
Yeah I love my 12X for its feel and programming. Seems weird about the loose battery on a +$1000 radio, but like you said "its fixed".
As for the packs, I wish I had more

No seriously though I bought 4 last year and 4 this year so it wasn't all that terrible plus the blue set I got on loan to "break in" and test. The Rhinos are tolerable at $130 or so a set while the TP kills me since they get upwards of $300 for a 10S set that most definitely does not outperform the Rhinos, but then the weight difference is a major factor as well. The good news is my E-Motion makes weight no matter what battery I use, and as long as I pay attention to where I place the different weighted batteries to keep the CG the same I don't notice a difference when I fly. Of course my Intermediate stick skills aren't all that discerning yet anyways.
Joe