I know there have been litter questions here, so I thought I'd add my
recent experience.  

I had switched Kami to Papurr from Scoop Away because I couldn't find
the unscented variety anymore and we wanted a little less dust for her
asthma.  Papurr was initially nice because the same size box was much
lighter, but I did notice a little bit of perfume about it.  Since she
wasn't bothered by it, we kept it.  

One of the sales points is that being made of paper, it absorbs odor
better.  Well, yeah... but not only do the clumps absorbed odor, all of
the litter sirrounding the clumps absorbed odor... and stayed in the
box after scooping.  This made it necessary to change out the entire
litterbox much more frequently than before.  

I was still planning on keeping on with it, but for the last couple of
weeks I haven't been able to find it anywhere.  The shelves were empty
at Target and Petco didn't have it.  Since we were out of litter I made
a snap decision to buy Swheat Scoop since someone else had suggested
it.  The stuff is interesting, and even with a little bit mixed in with
the Papurr, the odor level diminished.  It looks kind of gross clumped,
but this isn't about appearances.  Kami doesn't seem to mind it and,
commenting on what someone said, she hasn't tried to snack on it.  :)

FYI, Swheat Scoop is currently on sale at Petco for 10.99 for a 14
pound bag, regularly $12.99.  There is a $1.00 coupon in the new Budget
Living magazine.