The variac sure looks good and very Xmassy in the red paintwork. But is it the right gadget for you, i don't know.
Almost by definition a variac is NOT isolating.
It says in the spec' it's an isolating variac.
It's actually quite easy to make an isolating variac buy making a toroidal isolation transformer with the primary on the inside and secondary on the outside with the enamel filled off and the usual carbon brush assembly.
the only question I have is whether there's a requirement to go up to 230V for testing European equipment? It might be handy to test a universal SMPs over the full 0 to 250V range.