Black Ops makes a great close mic not only on guitar amps but also on bass amps, where I’d probably hesitate to place anything too delicate. It’s also an excellent vocal mic, particularly for those singers who always seem to sound thin, harsh or sibilant on capacitor mics. I think Stewart has judged the voicing very nicely: there’s still enough proximity effect to bring a welcome heft to sources that need it, but not so much that close-miking things makes them sound boomy or unbalanced.