In reply to:
Anybody on here with experience/knowledge of using it?
I don't but I do have experience of running two types of VPN wihtout it. One is a permanent VPN which exists between two routers at different location - whenever both routers are on (and the Internet connections at each end are working) the networks at both ends are ope to each other.
The other is between an individual computer connected to the Internet which can connect to one of the routers and access all the machines on the network beyond it as if on the same local network.
In my case, this is easily achieved because the router offers a VPN server facility. If that is not present on your network, many (perhaps most) routers offer a VPN pass-through and if that is not available, you can use port forwarding to achieve the same thing to a particular machine on the network (though that machine must be on at the time).
I can't see what Hamachi would provide which I don't have already, or, even if I didn't have a VPN server on the router, could have with VPN bypass or port forwarding. Certainly the reported failings of Hamachi have never appeared here.