I agree with you, same thing here in my country, people are so stupid these days.
Seems they have got lazy with the internet and computers and being fed with information.
Yes a dual reflector Gregorian dish performs about 15% better than the same size, my dish performs like a good 110cm Offset dish approx.
Also you got excellent cross polarization performance.
Mostly used in uplinks really for VSAT and such.
I don't usually post on American forums as i am active in Europe.
Anyway, here is my setup of my balcony installed Fibostöp Gregorian Offset 90cm dish mounted on the Moteck SG2100A in Stockholm, Sweden. ;)