I just looked over their website and listened to a sound sample of Bicycle Race,and imo they sounded pretty good.
Personally,I envy that you get the chance of seeing a Queen cover band. Here in the US,i'm on the mailing list for Almost Queen,but they keep playing in places I can't get to.
The decision is yours,but I think you should go for it. Otherwise,thanks for telling me about this new Queen cover band,well new to me.