I love Fitch - it is lovely and soft on piggie feet, absorbs smell and wee beautifully and is pretty much dust free. I get through a 20kg bale about every 6 weeks in my 5x2 c&c. However, I do find it quite wasteful as you can't sweep up poops. Whilst it's easy to spot clean any wet areas and replace with fresh Fitch, you can't sweep up dry poops without scooping up all the dry (and potentially reusable) Fitch. So you end up throwing away lots of clean and dry product which is annoying.
I've just swapped to fleece cage liners from C&S Cosies together with a potting tray at one end of the cage filled with Fitch and hay. We'll see how it goes!