Some really excellent posts on this thread. The wealth of knowledge, through experience, is quite staggering. Keep it up, Gents, as it makes wonderful reading. Actually surprised this thread has kept going - usually a closed-season topic!
I have nothing to add other than catching a big barbel using a 'pin on a through-actioned rod is really like nothing else. So much control and 'feel'. One can almost anticipate each run of the fish. I use braid, which, in my humble opinion, accentuates all in the previous sentences.
I spent a small fortune during the closed season on a pair of custom rods and two new shimano fixed spool reels. Albeit lovely rods (Evoke blanks made up by Andy Sliwa - who I can't recommend highly enough) and super smooth reels - I've used them twice this season out of three sessions, and felt like I'd almost betrayed my soul! Anyway, enough of that!