Sue,
they are utterly gorgeous. I do think they are the real deal.
Most Victorian fancy glass does tend to have lots of ingrained dirt & grime, but maybe these ones are so clean because they have been stored in a secure display cabinet for years, or had a particularly tidy previous owner.
Bernard,
I understand about the glassie cleaning products! I have a great array of brushes of all sizes, cleaning cloths, you name it.

They just look so authentic to me, the lovely colour is just right, the shape, everything.
Leni,
I've seen those repro epergnes about too. On Ebay fairly regularly in Australia, & also in several antiques shops here too! They are easy to spot, the colours are so wrong (horrible modern cobalt blues, bright greens, un-ruby-like reds, & worst of all, a hideous orange. The metal fittings are all new & shiny, too.