This exchange has a decent selection of 300+ trading pairs and a very impressive liquidity. It's trading engine can process 1.6 million orders per second, which is more than most other trading engines around the world. It charges a withdrawal fee amounting to 0.0005 BTC when you withdraw BTC. They have a frequently asked questions pages that should help you with any issues you have. There is also a 'submit a request' button where you can contact them directly.
It has a lot of things going for it, the main one being its very competitive fees. However, it’s not exactly what most crypto traders would call a “well-established” crypto exchange. The main drawback might just be the lack of solid information about the exchange’s background.