Okay, I voted YES, but only because I did buy one with an ILS. It was a M&P 340, and it was only offered (originally) with the ILS.
I've had no problems with the ILS engaging, shooting standard or +P .38 Spl, or a variety of .357 Magnum.
I've not had any of the other folks I've met have any problems with their New Model S&W ILS-equipped revolvers. This has ranged from folks shooting regular Airweights, to the Sc/Ti .38's, to the Magnum Airlites and up to the .500 S&W Magnums.
When I went to a S&W revolver armorer class I asked if any of the other armorers in the class had ever personally had a revolver exhibit an ILS problem (which they could confirm actually involved the ILS). None had. Naturally, a few of the older guys in my age group weren't exactly enthralled with the "aesthetics" of the ILS, but they didn't have any problems with their folks carrying guns with them.
The armorer instructor told me he had never had an armorer bring him a gun which had exhibited a problem with the ILS, either.
The portion of the class which dealt with the ILS was brief, covering how to remove the locking arm (or "flag", as it's called online), and replacing the small torque lock spring in the locking arm, if ever needed (like if damaged by someone doing some unauthorized monkeying around inside the gun
). It's a bit of a pain to manipulate and install the little spring, BTW. (I've done it for practice, just in case I ever need to do it to repair a gun.)
The bottom of the itty bitty dog-leg spring is held in place within a small, lipped recess within the machined groove for the bolt. If the bottom leg were to become dislodged, the locking arm won't be held down. I don't see how it can easily become dislodged ... unless someone were to tinker around, like removing the hammer and bolt, and allow the locking arm to tip and pull the bottom leg free of its lipped recess. I was once told by someone at the factory. that at one time they were looking very closely at production to make sure no assembly problems occurred which might result in the locking arm spring not being positioned and captured as designed.
Each time I've asked different folks from within the factory (repair, sales, customer service, etc), I've been told by each person that they've heard of either no, or very few, problems with revolvers with the ILS. The guys who acknowledge to have heard of an ILS-related problem said that it had occurred early on in the production models.
While I don't use the ILS for safe storage, or to prevent unauthorized access to my revolvers - (I have a gun safe for that purpose) - I can certainly see how some owners would appreciate a locking system that can help them in this regard.
I also suspect that internal locking systems are going to be something that's increasingly with us in the future of privately owned and used firearms.
In the meantime, however ... I bought another M&P 340, this time the latest variation made without the ILS. Yep, a no-lock M&P 340. Now I have 2 of them.
I've continued to carry my original one (with the lock), since it's provided good service to me for the few years I've owned, used, shot and carried it. I'll likely continue to carry it upon occasion, keeping it as a secondary, but most likely it'll become one of my "range beater" J-frames (along with a second 642-1 I bought a while back), while I continue to try and wear it out.
I'm glad to see S&W has been listening to its customers and has been expanding the availability of its internal hammer revolvers (Centennials) made without locks. I wouldn't hold my breath on them making external hammer models without locks, though. Not any time soon, at any rate. I've been repeatedly told that this is due to the advice they've received from their corporate legal staff.
It's seemingly still a matter of some debate, and apparently some small amount of contention, within the company. Oh well. Time will tell.
I'm always a bit suspicious when I read online about an ILS activating itself under recoil. Having looked inside the guns and seen how it works, I always wonder if the bottom spring leg had come loose from someone tinkering inside the gun, not realizing they'd done something which caused the leg to slip free of its lipped recess ... or from it not having been installed right during assembly.
Also, there are a number of other things that can mechanically happen which can "lock up" the gun, none of which have anything to do with the lock. I've seen my fair share of S&W (and other) revolvers have things happen which caused them to "seize" up ... and I'm talking about guns which weren't even made with internal locking systems.
Anyway ...
Given my druthers ... and not needing the ILS to secure my own firearms due to other storage methods I use ... I'd generally choose to buy a revolver made without an internal lock. (Ditto for my pistols, but look at all of those that are being produced nowadays, and look for them to increase.)
Just my thoughts.