I will weigh in here on the OP’s reference to the new Macs.
The Grand Mac is an excellent idea. The Big Mac has been pretty much unchanged for over 40 years; the taste is virtually identical to what it was in the early 70s when I first ate one. But in the interim, it has gone from being a gigantic burger (compared to the basic hamburger that McDonald’s and other outlets served at the time), to being somewhat smallish, actually, with most of its “size” derived from the middle slice of bun. By comparison, Carl’s Jr. (as alluded to in the OP) and Hardee’s, as well as other chains (Jack-in-the-Box, for example) have made a lot of hay out of offering absolutely enormous burgers. One-third-pound and half-pound burgers are now the norm for the top-of-the-line offering. McDonald’s needed to up its game.
The Grand Mac tastes pretty much exactly like a Big Mac. But it’s quite large, too large for me to eat comfortably in one sitting, unless I skip eating fries with it. So I was happy with the one I had, since on that particular day I was particularly hungry.
By comparison, the Mac Jr. should be avoided. The bun-to-meat-to-sauce ratio is all wrong. As a result, you don’t get the same classic Big Mac taste. I suppose for someone who isn’t expecting that, it might be ok (it’s kinda like the burger my mom used to make for me in imitation of the Big Mac back in the 70s). But for a Mac lover like me, it’s quite skippable. Which is too bad, because my metabolism much prefers eating something that size these days.
As for Carl’s Jr., they still do a decent job, but I’ve never been as impressed with them from the point that the franchised out their stores in the mid-to-late 80s. Prior to that point, when all stores were company stores, their Quality Assurance program was one of the best in the business. My then-wife, who managed one, lived in absolute fear of the QA visits; scores under 95 could mean losing your job as a manager, and they did things like white glove tests on the tops of door moldings. As a counter-person/fry cook for them (briefly!) in '81, I remember standing behind the cook station one afternoon using a paddle spatula to put exactly 5/8 oz. of mayonnaise on the crown of a bun over and over and over, with the asst. manager supervising me weighing the bun crown each time, telling me if I was within 1/8 of an oz., then scraping the condiment off and making me do it again. Why? Because that’s exactly what QA did when they visited, only you didn’t get several attempts to get it right. They simply grabbed a crown that you were preparing and weighed it. That sort of attention to detail in the stores, combined with a really good menu, made eating there a joy. After they franchised, QA went to heck and a handbasket quickly, and these days, it’s pretty hit or miss. Plus, I hate that they got rid of the flaked/formed steak sandwich. 