The actual acid can be easily neutralized (baking soda is fine), but I'm not sure if the sulfuric may not interact with minor inclusions (i.e., non-ferrous particles in the surface), carbon, etc. and leave a salt of sulfur (sulfate, sulfite, sulfide, blah) as a detectable residue.
Good: easy to do.
Not so good: if not completely flushed the head will continue to decay until it cracks.
Worse: a minor splash can blind you - close fitting goggles, gauntlets, disposable clothing, instant access to running water
Bad: it removes material evenly over the entire surface - SSR to the same degree as anywhere else, which isn't exactly best for all port shapes. At least Extrude-Hone removes material in the flow direction, and obstructive bits (flashing, casting lines, tool marks) more aggressively than the parent wall surface. Too bad it's about the same price as breast enlargement...