I have mixed feelings. I dislike the fact that internal locks mean more costs for me, and that they detract from looks. I like the fact that you have the OPTION to lock a gun up, and I don't buy the old argument that it makes the gun so less reliable. How many locks will actually break while trying to unlock it? Probably very few (my guess is LESS than the accidents they prevent).
Even with an internal lock though, you still have to take precautions with kids around and assume the worst (that the lock won't work). In other words, I keep guns safely secured in a locked safe unloaded, unless I have direct control over the gun (i.e. its on my person).
My final thoughts. Internal locks should be an option, not forced on us though. Those people that don't want them should not be forced to buy them. Likewise, those that want them (I wouldn't mind owning ONE gun with one on it) should have the option to buy one as well. Glock is doing it right. They give you the choice to buy Glocks with locks or without locks. If only the State Governments gave such a choice (I understand MD requires internal locks, and California is next to pass a similar law, I predict).