I used to love Grind Kings with their inverted kingpin back in the day. They would inevitably loosen after skating a while, but I've heard they worked that out.
Aesthetically, inverted kingpins still look silly to me on anything other than Grind King.
I now skate Aces because I love the turn. They are squirlier than Indies, and have very little bite (though I've heard the new Grind Kings are almost impossible to wheel bite on).
Having skated mainly Indies, Ventures, and Aces lately, the smith and feeble issue is worked out within the first 5 minutes of trying a few grinds. So, it's pretty much a non-issue, and not exactly a selling point for me.
That said, Dan Corrigan kind of has me sold on trying out the new Grind Kings.