These shelters are great! Heavy so the piggies can't flip them over and very large. My only complaint is that they have an inside lip at the bottom that catches poop. If the design could not have a lip and instead just come straight down to the ground it would be be better.
My guinea pigs love this house. I have 6 and I often find all six snuggled together inside. There are two entrances and exits so the come in one way and sneak out the other. Well constructed. Bigger than I thoughts. Works well with the Omlet Elgu.