[tcldr]

Hetzner is great value, but their networking has a few issues:

1) Networking is mostly limited to 1Gbps. Even private networking. You can request a 10Gbps NIC, but it has to be housed in the correct data center and adds a $48 monthly fee.

2) Private networking is IPv4 only so dual-stack private networking isn't possible. Also each public IPv6 address is /64. Would be nice to get a /56 to setup dual-stack IPv6.

3) Can't specify a subnet to assign a server to when using hcloud API/Terraform. You have to specify the required IP on the subnet explicitly.

4) As I understand it, the private network traffic isn't truly secure between tenants, so needs to be encrypted between nodes anyway.

Still, I'm betting they'll fix these issues as their offering grows.