My ARBs on my YJ and XJ never broke, but I did have occasional problems with solenoids, lines, and fittings and they have ended my fun on several trips. This weekend in Johnson Valley, a couple of rigs will ARBs in our group went down on the first day because of these little issues. The ARB unit itself is probably the strongest selectable unit you can buy, but its not maintenance free and requires the installation of an on-board air system. You can't go wrong with an ARB if you want a tough unit that works great when dialed in right.
I ran the Eaton e-locker in the rear of my JK when I had a D44 back there, and am currently running one in the rear of my TJ. They work great and were absolutely trouble free. They are not built as strong as the ARB, but are completely maintenance free and don't require an on-board air system. The only draw-back to the e-locker IMO, is that you must roll several feet before they engage and disengage. I ran the toughest trails you can put a JK through with this locker (including the hammers), and it worked. It survived 3 broken axle shafts (2 were Superior Chomoly) before I grenaded the whole rear-end when my ring gear broke. An ARB is probably better suited for this environment, but my point is that the e-locker is not weak either.
I am now running Detroit Lockers front and rear in my JK today (with manual hubs in the front), and this is by far the best off-road setup I have ever used. Its not the most street friendly or icy conditions safe locker combo, but it owns the trail and is barely noticeable on the street during normal driving conditions. IMO, I would stay with selectable lockers for a daily driver in bad winter conditions.
Thats what I have experienced, YMMV.