I've seen KISS twice; with and without their make-up. Both concerts were great. Old KISS is great, some of their newer songs are gay.
I've seen them two times also. The second time was when they came back to Pittsburgh a year or so after the first one in 1974-ish. The second time they were with Rush and Mott The Hoople.
Maybe it's THAT concert why my ears are still ringing?
Ahhh, my taste in music has expended some over the decades, though I still like a good crankin' rock and roll song on occasion. :)
Also, when did they play without the makeup?