I Have Operated a 7851 (had one at my station for about six weeks) and not that impressed over the 7800/ Flex 6700 or 990 Kenwood. I think the Icom SDR Radios has some real advantages over the Flex. The Icom 1.2 Khz Roofing filter is the best When using an external monitor on the IC7610 both Spectrum scopes are comparable. A K4D as been on order for over a year, in the mean time I just got two 7610s, I run dual diversity receive almost all the time. Elecraft told me at Hamcation that they were trying to get the K4D screen to emulate the 7610, wow they're behind the times! Still waiting, two 7610s = one K4D IN PRICE when you add on all the stupid extras that should be in radio in first place. Actually the price, if you look at the information, is not totally set in concrete either, what a deal!!!!