n channel width : 40 MHz (2 spatial streams)
ac Channel width : 80 MHz (2 spatial streams)
1. Can cost up to a quarter of the price of a Dual Pol dish kit
2. Easy installation (physical)
3. Very little surface area, thus minimal wind resistance
4. Easy alignment (the unit has a total of 9 antenna's on one PCB, refer to Con 1 below)
1. Very wide radiation pattern (refer http://i.mt.lv/routerboard/files/sxt-patterns.pdf)
2. FBR is high, thus the need to space devices properly on a HS increase dramatically
3. Relative short reliable range
Personally, I think the SXT (be it n or ac standard) is a great device IF mounted & configured with care. To use the SXT ac mounted 10 meters from the ground and keeping power to default would be a BAD idea, purely because that person has absolutely no consideration for any other Wireless users around him. These "rules" do not only apply to WUG users, but also everybody else out there. To give you an idea, I set an SXT of mine (mounted about 16.5 meters from ground) to scan, and within 20 minutes I have 100+ AP's in the list (some 15Km away), with about 30% of those being WUG AP's. Should you really wish to take SXT's waaay up, please use a Ricoffy 1.5Kg tin as a noise shield to minimize the effect on others. This also has a spin-off that it acts as a reflector, thus increasing the antenna gain.
On the use of ANY ac technology, I personally think that it should be used with great consideration for all other users (be it WUG or not). To me, this is common courtesy. Our spectrum is so incredibly full that adding new connections have become a serious problem, because finding a decent frequency with very little interference can literally take days of monitoring & adjusting. With ac now coming into play, its use will effectively cut our possible spectrum in half, creating headaches that would eventually fall back on the client. If my HS land with poor ccq's, I am eventually forced to lower speed to compensate, which in turn lowers the throughput to clients. Although some to a lesser degree, all WUG users will be affected (read Audi).
My view: Mount your SXT as low as possible to still have decent signal and throughput. If you need to go high, use shielding to compensate