My fear was that I couldn’t create an account, great models, fast service!
I was not sure if the files are fully supported for all 3D Softwares as advertised. For the moment all was OK! worked! it was easy payment, 3D Models World is a great place (better deals than other websites) I wish they will add more 3D Models.
My fear is that I would not be able to scale down the parts of the 3d model. but I was able to scale down the parts to a working size without any issues, purchasing the items through PayPal was quick and easy, If you need a file and it is on sale, go for it. models are well done!
The biggest fear was that the model is not very detailed and far from the real crane. But when I open the model using an AutoCAD I found that the model was very very detailed even I can directly use it for an FEM simulation in other commercial software. 3D Models World could help you a lot in your projects.