I'm an amateur musician. I'm using this Transformer with an Mesa Boogie Cal. 50, mostly at home (at a very low volume, sometimes with a power soak) and at the rehearsal room (at a low volume).
It does work. I have not had any problems with it during the 3 months I have been using it. I have felt a bit of a tonal improvement compared to the rubbish transformer I had been using before, but not a lot--the amp sounded well already. I do feel more at ease in terms of reliability and safety--but that might be a trick of my mind.