From what I've observed, a while back they at least stopped selling their products in the US and then appeared again with FCC approval and limited radio frequencies in the US-models. Non-US -models are unlimited and did not seem to disappear off the shelves during that time. All of the products available today, to my knowledge, come in both US and Non-US -variants.
Having been employed by an ISP and decided to do something with less night time hours and more floors above ground with windows, I have the habit of doing free consultations (meddling) in order to stay up to date.
Currently I warmly recommend Mikrotik (not their CRS-series though) since they have very little limitations. The most recent case involved pre-purchased AirOS-devices and it's lack of virtual AP:s. Why I find this a drawback is how Ethernet and Internet Protocol are designed. It was never meant to be that customers should share broadcast domains, a privilege that enterprise customers are granted but consumers rarely are.
To make a first class network experience for both ISP and customer, give every legal entity their own broadcast domain and subnet (read: routing in access layer). As WISP:s, you should be conservative on allowing unnecesary brodcast-packets to propagate, especially through half-duplex links. This also defends your network from rogue DHCP and what not that might bring the entire network more or less down. I've designed a few FTTH-networks this way and these networks have never been disturbed by customer shenanigans.
