To be fair, they do work actually quite well, but ONLY for the simulators which they are designed for. Go install some of them into P3D v2 or v3 and you are in for a bit of a rude awakening.
Some of them are simply just old. The cuba sceneries can be made to work if you know something about converting models, but it is a pain. Same with a couple of the other ones.
There are others which works beautifully but I am not getting the textures for the autogen buildings to install, so I have 3 or 4 airports that look great, but they are surrounded by black boxes with roofs.
All of this can be fixed and should be fixed. I do see that they have released a couple installers for P3D and so I do give them credit for that. No reason why they cannot do this for the remaining products.
Let's get all this old history behind us and go all into 2017 in a good position together.