Has anyone purchased CERTEX-GH overhead cranes?

Recently, I need to buy several sets of overhead cranes with a lifting weight of 5 tons and a span of 5m and 3.5m. Someone recommended CERTEX-GH overhead cranes to me. I have also communicated with their customers for a while, but there is no Stimulate my desire to buy. If anyone has used their 5 ton overhead crane, please tell me about your experience, thank you very much.