Slayer's great live. It took them over an hour to get on stage with a pretty minimal set of props when I saw them, but it was worth it. They just kinda get out there and play nonstop and then walk off stage so don't expect any interaction.
I'll second that... when I last saw them (early 90's, touring for "South of Heaven" and "Seasons in the Abyss") they put on a minimal show but it was
awesome.
Funniest part for us at the time was that we saw them close to the
end of their tour and by that time they'd gotten into the groove and had to add several more songs to their set in order to fill out the time; they'd gotten into the rhythm of playing fast enough that they shaved close to 10m off their set just from player faster.

Seeing them in August along w/Zombie, which should be good. Sheesh, only been 20yrs since I last saw 'em...
