The Van Ness litter tray is a good litter tray at a very reasonable price. It is easy to use and clean and I'm very happy with it. It's a good size, the cats like it and I think it's a pretty good litter tray over all. Nothing flashy, but it does its job well.
I like the fact that the bottom tray is very deep, which means I can fill it with plenty of litter (important if your cats a scrabbler or digger).
Also, because its so deep, the high sides mean there's no mishaps with urine hitting the hood and trickling down and out of the box (I understand this is a problem for some cat owners). Any stray urine hits the sides of the bottom tray and runs straight into the litter.
The filters are bit annoying sometimes, as every now and then my cats decide to claw at them and they're tricky to get back in place, but that's a minor niggle: Van Ness Replacement Filter F6
Also the front flap/door comes off a little too easily perhaps. The cats have never knocked it off - but I constantly do when I'm cleaning the unit out. However, again, it's a minor frustration that takes about 2 seconds to put right as it just clicks back into place..
A handle on top means the litter tray is easy to manoeuvre about and I find the unit very easy to wash and keep clean. There are 4 slips which keep the hood firmly in place - and I also use these to clip the litter liners in place too.
Just in case: It stands to reason, if you're looking at litter trays, you might also be looking for cat litter - if so I can thoroughly recommend this stuff: Cat Litter Cats Best Okoplus Clumping 15kg is an organic/natural biodegradable clumping litter that can be flushed down the toilet, and is safe for you, your cats and the environment.