I've been trying to sort this out in my head for a bit. I like the TWF only costs a feat, but I understand the math and realize that in general, a TWF gets the shaft (excepting rangers and rogues who can excell at it). I like the benefits one gets from AU TWF (esentially two attacks at BAse) and with their massive TWF you can even use two longswords or two bastard swords at full bonus. Only problem is that AU requires Ambidexterity, a feat that was wisely dispensed with in 3.5, simply because that outside of TWF, it has no use whatsoever (nothing in core attacks a person's hand, and what action is it to switch a weapon from one hand to the next?).
So what if TWF provided both of the AU benefits (ie you get a second attack at no penalty and 1/2 str)? The person not looking at the math shudders at the seeming unbalancedness of it, but the me that knows the math realizes this isn't nearly as bad as it seems.
Thoughts? Frank, you want to enlighten me on how bad this works out vis a vis the math invovled (not that I'm asking you to do it, I just assume you already know it
Tywyll