The 24/7 trigger is an odd one, and I'm not surprised some folks have trouble shooting it.
Here's the odd part: experienced shooters have more trouble than novices with it. I think it's because it goes a long way with no resistance, then it starts to engage at the very rear.
While I can see the benefit in terms of safety, it's unpredictable, and it takes some getting used to. I shoot revolvers in DA alot, and I'm expecting some resistance. When I don't feel it, I take the slack up a bit too quickly, and my first shot dives low.
Once I'm used to it, it's okay, but still...this ain't a match gun. If you slap away on it, you can keep the rounds on paper, but for those of us used to controlling the trigger, it's a hassle.
In terms of reliability, I've seen some that are top-notch, but about a third come back for service. Rather than wait weeks for Taurus to fix it, many people choose to pay a gunsmith to fix it.
More disturbing is the number of the Milleniums and 24/7s we've seen that won't function out of the box. I've seen two that would not ignite the primer on any ammo. They do test-fire these, right?
What really gets me is that their revolvers seem to have more out-of-box issues lately.
It's a gamble. If you get a good Taurus, you've got a good gun. If not, it can be quite a headache.