I'm a relative newcomer here, so take my comments with a grain of salt.
First off, I appreciate all the info and comradarie here on the TDR. This forum is a cut above the average and I consider all of you CTD brethren among the Best People on Earth (B. P. O. E. ).
That said, here's my take on Jacobs vs other exhaust brakes on Rams.
I've seen nothing to suggest that Pac, BD, etc are technically inferior to Jacobs. In fact, in light of the current "no sell" hold on Jacobs, one could argue that the opposite is true. At least at this time until a fix is implemented.
Regarding warranty, Jacobs does appear to have a unique sweetheart business arrangement with Dodge. Although Cummins may endorse Pac and others on other Cummins engines, I've seen nothing to indicate any endorsement or approval of Pac, et al specific to the Dodge Ram Cummins.
What this means to me? If I install a Jacobs and for some unlikely event I make a warranty claim regarding my engine, Dodge/Cummins/Jacobs say they'll stand behind it. I'm talking of a case where whatever damage is alleged to have been caused in whole or part by virtue of having an exhaust brake installed.
If I have another brand of brake installed, one that is not endorsed by Dodge and/or Cummins, then I could be in a gray area regarding warranty. The Magnussen-Moss act says my warranty can't be denied because of an aftermarket accessory. That is unless the damage is determined to have been caused by the aftermarket accessory. In that case, my warranty could legitimately be denied for a non-approved accessory.
If I make an engine warranty claim, the dealer may be quick to point at my non-approved accessory. And the burden may be on me to prove him wrong. The advantage with Jacobs here is "it's all covered" and there should be no questions asked.
How likely is it that I could damage my engine with a Pac or BD? Not very. The risk seems pretty minimal to me.
What I liked about Jacobs was 1) least warranty risk, 2) they claim to do a lot of testing, 3) reputation, and 4) really cool stalk switch.
What I don't like about Jacobs is 1) vacuum pump/belt, 2) much higher cost, and now 3) poorly handled "stop sell" mystery apparently due to a safety issue.
At this point, the bad far outweighs the good with Jacobs IMO. There are other very good choices out there and I will probably go with one of them.
If I'm wrong about any of the above, somebody please correct me. Won't be the first time.