From what I've heard, and for what that's wroth, the new ArmorAll (which should be on the shelves virtually everywhere for the past number of months) has addressed the issue of dash cracking. Apparently, the low-gloss ArmorAll never did suffer that issue.
Anecdotally, I've always hated ArmorAll, but when the new style Caprices came out in the 1990s, they had the giant dashes. When I was running the fleet, they got a dose of low gloss ArmorAll almost every day, and there were never any issues.
I used to like STP Son of a Gun, but that disappeared when they merged with or got taken over by the parent company of ArmorAll. The Rain-X dash protectant is pretty good, but a little greasy for some applications. Lately, I've been using Meguiar's Mirror Glaze Vinyl & Rubber Cleaner/Conditioner. It's not overly messy and not overly glossy. It sure makes the rags yellow, though.