Especially the new ones. Some older Epiphones might have had some issues, but ever since Michael Voltz came over to Epiphone from Gibson back in around the year 2000 or so, Epi quality I think has gone up big time. I think they are good enough for professional use. I bet there are many professional musicians who play Epiphones. I read somewhere that one of Les Paul's most favourite guitars ever was an Epiphone 2008 LP Custom that he cherished. It was his idea back then for Gibson to buy Epiphone so that the name could live on. He even developed his Les Paul guitar first at Epiphone before moving over to Gibson. There's a lot of history going on with Epi.