FOS is where the sound is supposed to be good
on Licks Tour I was FOS in Amsterdam ArenA - famous for being ECHO ARENA - and the sound was MARVELOUS! Than in 2006 to my surprise the sound wasn't that good (wasn't that bad either, but just...OK/good).
and Milano 2006 - the sound was totally fcuked up in FOS - I couldn't hear guitars for most of the show - can you believe - watching Keith moving and playing like a tiger and couldn't hear a freaking thing out of it ! But at least - we were there for him so he had nice warm welcome from tribe
BUT...
I've been to many other shows FOS & I gotta say most of the time sound is THE BEST in whole venue. That's what it is supposed to me. So despite those small exception above the sound in FOS is most of the time
GREAT.