Let me talk about my experience in DBC!
I feel DBC is good. They are very professional. You can see it from many lectures in their app about all kinds of majors in different regions. Although there're still some problems on the livestreaming function, but it's OK to watch. The mentors are great. They are the current employees in my target companies. They shared their job hunting expeirence and working experience, making me feel good. Also, I practiced for the online tests on the app like crazy before the fall recruiting. They collected many questions of different companies in recent years, including almost all of the test questions of my target company. The app is used to deliver classes and to communicate with the mentors and consultants. The responding speed is OK. Sometimes you need to wait due to the time difference. Generally speaking, it's great for helping me entering my dream company.