Best live gigs: GNOTR and Hallucinogen way back in the days
Not quite so long ago, Logic Bomb, from the Headware era.
More recently Son Kite and Jaia
Worst live ever: Infected Mushroom at Soulclipse - They were truly appalling, couldn't play the guitar, can't sing, can't write lyrics either and grandstanded their way through a dire performance.