Have been using the wood stuff for over 10 years now
and would not go back to the heavy clumping stuff
I used to buy (fullers earth ??) still gets scattered about now and then, but that depends on how urgent the cover
up is
I store mine in the immersion heater cupboard- no chance of damp in there, and I've just bought a dyson animal
handheld hoover, no more brush and pan
nah tis good stuff, economical, envoiromentaly friendly etc,etc