Litter-Robot 4 Ramp - Black

I've owned a LR3 for about 4 years and a LR4 for just over a year. We have multiple cats/litter boxes. With no ramp the LR4 was full about once every 4-5 weeks (very low usage). With a little step stool in front it went to full every 3 weeks - this is what made me look for an official ramp accessory (which was not available when we bought the LR4). Now with the ramp it's full every 5 days! Usage has gone exponential by installing the ramp which lets them see into the litter box before climbing in. A bit expensive for what it is however in our case it turned out to be indispensable. the missing 5th star is because of the price. I'd even argue that it should just come with the LR4 and not be an add-on.