Ubiquity is based on the Vyatta platform, which means it’s pretty decent as a network device. Unless you’ve got gigabit WAN speeds, it will probably be sufficient for your SOHO needs. But I would split the wireless functions from the Routing/firewall functions. You might even do a three-way split with dedicated devices for each function.

But most Ubiquiti devices are going to need some sort of a management machine, running their proprietary software. That could be an old repurposed desktop, a small format computer, or something else. But it will need to be a more mainstream OS — I don’t think a Raspberry Pi will do the job.

I’ve heard good things about Mikrotik, but then they are also vulnerable to the recent VPNFilter malware. And they might do okay on the Routing side, but I don’t know how well they will perform on the firewall or VPN server side.