To reply to, um, myself:
I've given a deeper look into it, and I want to reiterate: I love the soulknife, as does anyone else I've linked it to. I can see how the HD is problematic - the skirmisher is staunchly HD8, I think, but the defender is very HD10...and striker is
somewhere in between. That said, the vaguely potential HD is quite literally the
only flaw I can find in it. I especially love the Twin Strike skill for how it makes a skirmisher type of character an actual
skirmisher, and how it'll work with Spring Attack and some of the Pathfinder feats.
Two things stood out to me. Not really flaws, just...tidbits, I suppose? Both involve the On the Run skill.
1) It says you need at least one Striker skill. I assume it's a typo and is meant to read Skirmish?
2) From my understanding, it's essentially Shot on the Run/Spring Attack as one skill, but it does
not qualify as the feat to unlock other feats or PrCs (which would admittingly be way too much, since those require dodge/mobility
anyways). Just making sure I have that correct.