Im not really sure the exact meaning when people say 'boutique amp'. I could name some boutique amps, but what exactly makes it boutique. I wouldnt say mine is, anyone know?
Usually higher quality. Small companies.
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Small, little known company usually. High price tag and handwired with the utmost quality control.

Pretty much.

Just about every boutique amp I've played is full of win, whether clones or originals. Handwired, almost always use the best parts, and almost always sound amazing.