I believe that is the fourth transceiver that they have developed in the
past three or so years. I almost purchased their Sun SDR pro as a
backup to my Flex, but decided to wait due to my questions not being
answered. At the Orlando 2014, I noticed while waiting, that the
computer display indicated that receiver was going into overload due to
all the local interference. When I questioned them, they had no answers
but to give me a better price. SD transceivers are fantastic when
built and designed "right". I trust Flex. They have always been honest
and committed to developing the best SD transceiver on the market. As
a former business owner I understand how much integrity does matter and
that you can not put a price on. So I am now in line to upgrade my
flex to their next generation. By the way does Expert have a upgrade
policy like or similar to Flex? Also last time I checked on their past
transceiver software upgrades I did not see many. Good Luck on your
purchase. I am sure Flex will be back in your future. 73