When buying a press brake, there are several factors to consider. Here are some key points based on the information:

1. Machine Type and Manufacturer: Different manufacturers offer different types of press brakes, each with their own unique features and benefits.
2. Bending Length and Pressing Force: These are crucial specifications that determine the capacity of the press brake.
3. Advanced Technologies: Modern press brakes incorporate advanced technologies. These technologies can enhance productivity, performance, operation functionality, and safety.
4. Additional Features: Some press brakes come with additional features like auto tool changers, offline programming capabilities, light curtains for safety, and network capabilities.
5. Company Series Type and Function: Different series have different functions and capacities.
6. Key Capacities: This includes the maximum tonnage, shut height, stroke length, open height, throat depth, and maximum speed.

Before making a purchase, it’s important to understand your specific needs and requirements. This will help you choose a press brake that is most suitable for your operations.