As long as my powertrain is under warranty, Im using my MDS.
Food for thought: I just traded in my '07 Charger R/T (for an auto Challenger R/T). I bought the Charger at 44,500 miles and put the same amount on it for a total of about 90,000. It came without resos and I could always feel and hear the MDS coming on or off. I assumed it was normal, if unpleasant, although many here stated not being able to tell. Towards the end, though, it got really gnarly and I couldn't stand the MDS at all. Vibration and noise a gogo and at almost every speed. So I now drive my new R/T mostly in AutoStick until I can kill it (the MDS) with a tune or the factory finally comes up with a fix. And I CANNOT TELL what the MDS is doing the very few times when I'm in Drive. It's seamless.
Whatever you think of the cause for the TC failures, there has to be a cumulative effect. Eventually the tensioner assembly self-destructs or the chain snaps, but the noises and vibrations seem to be precursor signs of your impending doom. So what I'm saying is that the owners sticking to their guns and using the MDS all they can during the warranty period may be setting themselves up for an out-of-pocket catastrophe later. Unless you plan on a preventive tear-down or parts replacement right before your warranty is up, it's just an opinion, but I would stay out of Drive as much as possible. I like my car and my money more than the principle of, "they built it that way so I'll use it". Instead I go back to my own guiding principle (KISS) and say that the cylinder deactivation was just a time bomb and the ball is in my court to defuse it, regardless of why Chrysler put it in there.
I suspect it's not the only thing built to kinda last until you're out of warranty. Knowledge is power, and online forums are full of good intel (once you discard paranoia and hype)... so use it or lose it? I know I'm making good use of those paddles and that stick.