rob f wrote:
...Is the Mirage range any good ?...
Mirage was introduced in 1995 sitting below Veloce in the hierarchy, with only Avanti (1995 to 1999) and Xenon (2002 onwards) below it; in 2000 and 2001 it was Campagnolo's most basic group. In other words it sits in the middle of Campagnolo's second tier of groupsets, intended as OE on mass-market bikes.
Whether it is any good is more subjective: what do you intend to do with it? Go racing? No: too heavy. Grace a concours build? No: not pretty enough. Form the basis of a practical and regularly ridden bike that you needn't be precious about? Yes.
Certainly, I think the frame is better than the assortment of parts currently on it and I'd be looking to put together a complete group for it: either Veloce or, if I had a bit more cash or the patience to wait for bargains, even Athena/Daytona/Centaur (Athena was replaced by Daytona, which was renamed Centaur), depending on when the frame dates from (assuming you want a period build).
Incidentally, those Xenon shifters are 9 speed, as Xenon wasn't available in 8 speed.