Has anyone tried this LNBF? They look totally different. I'd like to know how it compares to the non-FE version (if it has any better sensitivity.)

WS International Wholesale Satellite Distributor and Supplier of Free ... (http://www.wsidigital.com/)www.wsidigital.com/
12/19/2011: WS International ESX521FE high stability Ku LNBF in stock now

Could this be the answer to using one C-Band LNB to receive Circular and Linear signals at the same time without changing dielectric plastic plates! What are the quality reading on these?

Think it has 4 receivers/ (LN-B) amps but only linear (or circular if you add the di-electric plate). I was looking at that too a while back.
Would be nice to have an L/C combo LNBF for C-band!
-C.

What I found is the ESX521 is actually a single output Ku lnbf and not C band. The third number designates how many outputs there are. So the ESX522 is a dual output lnbf and the ESX524 is quad. The ESX521FE has a longer housing and I am not sure what else. I found the info earlier today but I was in a hurry and now I cannot retreive it! :o
There are universal as well as standard versions available. One neat one is the ESX521U-AM which is an adjustable monoblock from 4 to 12 degrees!

The C band lnbfs are the ESX241 with single out and ESX242 dual and ESX244 quad. I too would love to see a C band lnbf that is capable of doing circular and/or linear without changing the insert. ;)