1. As they do not officially sell LXC anymore, they try to push you to KVM line if you face problems with LXC container.
2. My VPS was used as wireguard server. Few times a year they upgrade LXC node as well as kernel. And of course they fck up wireguard module and wireguard become unusable. You must contact support.
3. Now support. Today I contacted them with the kernel problem and received back a generic, L1 type reply "we will pass this to our admins" and that L1 drone requested a root password! from me. That was very unprofessional from unmanaged VPS provider. I was shocked. After 5 hours with no response and critical problem fix I canceled server.

In the end, ~15 months used that tiny server. 7 tickets fired in that period. Almost all of them was about that fckin wireguard kernel module. Today I have moved to oracle free tier and succesfully enjoying performant server.

Do I recommend Terrahost for prod? Yes. They are good enough at the moment. Just push away those L1 drones and get to talk to L2/L3 if support case is emergent.