This is a great extension from what I have found so far. I love that it is open source and modifiable. This has the best value of features, simplicity of installment and use, mixed with the low price. I only gave it 4 stars because it is new, and it has a lot of room to grow. It could use more versatility in choosing which fields are required or not required, and it would be nice if there were more ways to customize to an individuals needs that didn't require programming to do. But really, I tried several other real estate extensions, and this one by far took the cake.