Liam,
Never tried it and it seems geared towards picking spooky fish from skinny water using small nymphs, could be fun. Whereas close to us there are many more fish holding pots which I'm going to try and tackle more thoughtfully this year.
then again I'm more than happy wandering about with an unused dry.
Glad to see you giving it a go & hopefully you will pick up some fish. A couple of seasons ago I tried upstream/ across stream nymphing using longish leaders (20 - 22 foot) with an 18" section of greased Hi-Viz backing inserted in the mono leader. It was good fun seeing the 'indicator' stab away but there were times when the wind had me wishing I wasn't such a twat, the largest fish I recall was 1lbish but there were plenty of smaller stuff and the fishing is exciting from a visual aspect.
Iain
I'd guess small tungsten beaded PTN's, GRHE's, shrimps and olive nymphs would be a good place to start.
Iain