Any experience with extreme power line networking?

I'm looking for some "real world" experience with Ethernet-over-AC-powerline devices. I'm trying to deliver Internet to an outbuilding on a farm. The outbuilding is maybe 150 feet line-of-sight from the Wi-Fi router, but masonry and steel walls kill that signal. So I'm considering a... show more I'm looking for some "real world" experience with Ethernet-over-AC-powerline devices.

I'm trying to deliver Internet to an outbuilding on a farm. The outbuilding is maybe 150 feet line-of-sight from the Wi-Fi router, but masonry and steel walls kill that signal. So I'm considering a powerline networking kit.

The AC wire path from the router to the outbuilding is close to 200 feet, mostly in underground conduit. BUT: the signal would pass through three subpanels, as well as the farm main panelboard. If the signal is riding the "hot" (black) wire, it might pass through six circuit breakers.

No transformers, at least.

This is a lot more demanding than the typical application for a powerline networking kit. Before I spend money on a kit, does it stand any chance of working?
Update: Thanks for the thoughtful answers. I've already got "Ethernet to second switch and WAP" serving another part of the property. That would be my first choice for this outbuilding, as well. But there's a paved driveway to cross. I can't trench it, and an aerial run would have to be high... show more Thanks for the thoughtful answers.

I've already got "Ethernet to second switch and WAP" serving another part of the property. That would be my first choice for this outbuilding, as well. But there's a paved driveway to cross. I can't trench it, and an aerial run would have to be high enough to clear semis and "Max Max"-looking farm equipment.

"Ethernet to wireless point-to-point bridge" would work, as long as I can protect the exterior antennas from storm and snow. But it's costly.
Update 2: Again, thanks for the solid answers, all around. I'll probably be best off pulling an Ethernet cable the length of the main building, and using a wireless bridge for the final hop, across the paved driveways.
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