Aerials are carefully and very (small c) conservatively designed speakers. Mike Kelly, the designer, has strong ideas about how things should sound and takes a very analytical approach to making it happen. (I believe he was a plasma physicist before going into audio but can't remember where I read that.) And most of those involve lots of juice -- how many people specify 350W - 700W at 8 ohms for a center channel?
In my inexpert opinion, their older models are among the best deals available on the used market today. Everything is massively overbuilt to the point where hardly anyone wants to ship, so if you can find them in your area you are golden. I got my Model 8s (120lbs each) from a guy in NH for all of $1200. Cabinets hand built by Hornslet in Denmark, titanium dome tweeter, 28Hz - 22KHz