I have been using the Flex for the past two weeks. I wanted to play it on a variety of gigs in different rooms. My set up during this time..
Aaron Reilly bass> FC,EAP> Flex pre> QSC 10.
Over all I am thoroughly impressed. Great EQ,with separate blending for two channels.All the bells and whistles,in a very compact and well built unit.Bottom line, it can deliver a great tone. I have received a number of unsolicited compliments
about the sounds I got, over the last few gigs and concerts.
I have been using the Headway for several years,and still will continue to use it on occasion,but the Flex is a winner. I will look forward to using it with the doubler through the Big E.For all you of like myself looking for that great natural bass sound, this might be what you are looking for. I have used AI amps off and on since 2000,starting with the old Beer keg looking amp,I think the folks at AI have really stepped up their game with this one...sorry I can not comment on the amp section,but the Pre is a a super piece of gear!...