Draytek Vigor 2820n + PCCW 30M

I am now using PCCW 30M modem +DIR655

anyone know if I can just use draytek Vigor 2820n to replace both the PCCW modem and DIR 655 together?
Is it difficult to setup?
Will the draytek have good speed?
Anyone have experience with this setup?
Do I need a gigabit switch if I use the draytek? I might have to connect up to 8 devices when I move to new house.

提示: 作者被禁止或刪除 內容自動屏蔽