We've recently swapped to the clumping Catsan and wish we'd done it years ago - our spare room is no longer permanently coated in a layer of fine grey dust :-) Using litter tray liners helps to save any 'unused' litter and cleaning the tray out is so much easier. We have a large tray and find a box of litter lasts a week - would definitely recommend.
Been looking for a while for a good clumping cat litter that's not messy and easily carried out of the tray, doesn't smell unpleasant and doesn't turn to a sticky concrete when soiled. This ticks every box so far. Only downside is that it's a little pricey but does last longer than others I have used. Only further purchases will confirm how economical it is in the long run, but definitely willing to find out.