I have to agree, the Bullets are probably the way to go for many reasons. They are made for outdoor use, they offer more flexibility when it comes to frequencies and options and as you said, you can shift the frequencies and bandwidth to offset and reduce interference. Not to mention they are newer technology (they have POE).
The Linksys are nice because they are cheap. The BBHN firmware manages the network configuration and IP addresses automatically, but they require outdoor enclosures, adapters and some hardware modes depending on what your requirements are. Weatherproofing any enclosures (including the mentioned above) is challenging. It's a tight fit even with the circuit board removed from the Linksys case. Most of the holes don't line up and the unused holes will have to be plugged along with the cable entries and still allow for accessibility and changes. And then there's the adapters from the RP-TNC to N connectors used on most parabolics, panels and omni antennas. None of these are a big deal since we hams thrive on the home-brew concept and adapt to change, it just requires a little more thinking outside the box!
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Overall though, the cost difference between a Linksys based node and a Ubiquiti Bullet may be negligible and the added features and flexibility of the Bullets appear to make them a better choice. With BBHN for the Ubiquiti products in beta test now and a release scheduled out early next year, the combination should prove to be a good fit for BBHN-Mesh.
The BBHN firmware makes meshing pretty much plug and play. Especially when it comes to managing the mesh network. I not sure that plug & play is a good thing, although it does make it easier to setup a mesh node/network, "Hams" still should have a good understanding of the basic concepts of the equipment and technology they're playing with.
I've been following the Seattle digital guys for about six months now. They have a different approach than the Austin group. Both have their pros & cons. I've downloaded all the documentation files and firmware for the Bullet for the NW-Mesh folks to flash my bullet. Coordinating IP addresses and and getting it to talk to the Linksys BBHN mesh will be interesting ,as it's all manual. Should be an interesting learning experience to fill the time until the BBHN firmware is released for the Bullets.