StrongU Miner Support/Profitability

Hey there I recently just found out about StrongU Miners and just wanted to ask how they perform and how the support, shipping and customer service is. Because after they perform pretty well for their price. But right now im not really sure about them… does anyone has experience with them?
And which one has the best profability/performance for a budget of 500 - 4000€ (4500$)