Here is my understanding and take on this "CTS blanks break deal" - There were some issues with the CN (BSM) blanks initially, and CTS made good on replacing those blanks with their redesigned versions. I haven't heard of any further problems with the later version. And I know of PLENTY of CTS users out there.
So we're all on the same page, here's some "history," for your consideration - The BSM rods came about because Capt. Neil had asked CTS for a blank more moderate in action than the BS series that were selling very well at the time. CTS complied and sent over the first batch to Neil. Because there was no official model number on those blanks at the time, Neil went ahead and labeled them the "CN" series.
He did build on that batch and a seriously disquieting number of them failed, some quickly and some after a season of use. The breaks were consistently 14” down from the tip, so clearly there was something not quite right going on there. Neil got on the phone with CTS, explained the situation and CTS agreed to replace the original blanks that broke with updated versions, with more reinforcement at the critical point. Apparently it worked like a charm and those second-run blanks have lived a long, happy life. Capt. Mike is the owner of one of those second-gen CNs. He certainly has put that CN blank thru its paces and has caught MANY outsized fish on it, on his boat and mine.
Anyway, CTS liked these Capt. Neil-requested, more moderate "BS-style" blanks so much that they began offering them to everyone else, as their "BSM" series. I do not know if they still carry them in their production blank inventory, but they do offer the BJ series, which are even more moderate than the BSMs were.
The BJ (Bay Jigging) series is very nice, quite moderate, but not as slow as a true "Slow Pitch" blank would be. And that's another subject, because there's all sorts of "Slow Pitch" rods out there, some moderate and some quite slow. And some even in-between, just to add to the confusion.
Staying with CTS for the purposes of this post, they also offer their version of a slow pitch blank, called the "SD" series, which acronym is a mystery to me. In any case, my good friend Billy, "BillyPro" on some of the fishing boards, had Ray's Customs in Miami make up his CTS SD-250gram slow pitch stick for fluking - and its a damn beauty. Not only physically, but also in its gorgeous deep bend when cranking on a biggie.
The SD series is considerably slower than the BJ blanks, but still offer good horsepower in the lower half of the blank - sort of like how a Jigging World Silver Bullet bends, if you've ever seen one of those under load. I wish I could pull the video from his FB page, but there's one out there of him cranking on what turned out to be an 11lb fish (Nantucket - where else?). The rod exhibits a deep, beautiful bend that can really cushion the head shakes of a brute, without being a "marshmellow" blank.
In my own case, as I've written before, I own a BS702, 703 and 704, plus a BJ702 - all wrapped by Capt. Neil, who is no longer "in da biz," as the saying goes. All quite beautifully done, and I expect all will live a long, happy life.