Does anyone use Health Meter cat litter?

It's a neat idea...and my cat has had problems with crystals and sometimes it's hard to tell if she's just being a little bugger and is upset about location/smell/whatever of her box, or if she really has a urinary problem.

Unfortunatly though there are no reviews on the site.

Has anyone used it?

Careful observation will be about as accurate ...if you suspect and have no er vet or your vet avail then try it for a day