Tactics fans: What do you think of turn order?

I've mentioned a few times I'm working on making a tactical RPG engine, and I'm finally at the point where I'm doing the actual important part of determining turn order.

It's a harder design decision than I thought, so I thought I'd ask for opinions.

I'm trying to make a game in the style of Shining Force, where the turn order is determined by a unit's status. There's quite a few games like that, but I'm wondering if that design is actually good. The thing that makes that style of game good is that they're actually fairly easy, and the "noise" of stat-based turn order, where you can't depend on a specific turn order, seems to make the game harder. Or at the very least, it closes the door on more precise tactics. I've had plenty of experiences where I thought a unit was safe because they had enough HP for one more hit, and the enemy ended up hitting them twice before their turn came up.

In reality, I'm actually pretty set on keeping this in my engine for better or for worse (boy, is it hard to resist expanding scope), but I'd be interested in hearing some opinions nonetheless