remember way back when, when ty tabor was starting to get some recognition for his guitar tone, in the early works of King's X?
everybody wanted to know what his rig was, and he kept it hidden in a non descript box...
after all that time went by, he finally admitted that it was a solid state Gibson Lab series amp.
and a bunch of pre/post processing with eq's and whatnot.
if you have a tool (IIc+) that isn't giving you the sound in your head, you'd be crazy to hold onto it, just because a bunch of other people think you should.
same thing with guitars...
pedals....
speakers...
all that crap.
there is lots of hype surrounding gear in general, because everyone wants to believe that the cash THEY plunked down for whatever they have, was totally worth it..
and maybe it was, for them.
If you have played a THD flexi (i have, it's an awesome amp), and you like it better, then that's all you need to know, and you can take advantage of the limited availability of the IIc+, and the demand.
i'd never sell that amp, til you've demo'd everything you can possibly consider, and have made a decision that way.