I believe the base of the triangle covers 4MOA at 4X.
Choice of reticle is a personal thing. To each his own. I personally like the BAC triangle. It's extremely fast at close range and is immediately visible even in good light. At short range, you just plaster the whole triangle on the target without worrying about shooting high. At long range, you use the very tip of the triangle for precision aiming. The triangle reticle is obviously not as good for holdovers as the mil dot, and doesn't have the ranging capability, so in that respect, the mil dot is superior for long range. From the standpoint of reticle subtension, no dot (one that's still visible, at least), no matter how small, is as fine as a sharp point; it can't be. A dot with crosshairs will always cover more of the target than an aiming point that terminates at a sharp point. The triangle provides a very clean, unobstructed sight picture.
Most shooters are accustomed to using conventional crosshairs, so the triangle takes some getting used to. Because it's a radical departure from the familiar, many can't warm up to it. Trijicon introduced the various crosshair/dot reticles in response to complaints about the triangle.