It is probably a good thing that most of the newer S&W revolvers have the ILS. My checkbook thanks me.
I have one J-frame with the lock. No problems with it so far after about 650 rounds and miles of pocket travel. I am strongly considering ordering a no lock 442 from the local cop shop to vet for carry and use the lock gun as a trainer.
I would probably have several of the newer K and L frame models if the ILS was not a mandatory item. One of the short barreled M66s would be first on the list.