The biggest drawback is that you may well discover that your current router can’t support your chosen VPN’s dedicated router VPN app, if it has one at all.
If this happens, you’ll have to either buy a new router that does, or install DD-WRT firmware to allow you to manually set up a VPN connection – you can find a list of DD-WRT-compatible routers here. There are also some other options, including Tomato.
The other problem is that it’s more difficult to change your VPN’s settings because your router doesn’t have a screen or interface. Any alterations will have to be done through your router’s dashboard on a PC.
However, some VPN services have made the process far simpler than expected – one of which being ExpressVPN. It has a dedicated website for setting up your router VPN, and apps specifically designed to get your router protected quickly.