I would happily eat vat meat without a single pang of conscience.

Possible exception: if it was getting to the point where farm animals were becoming endangered, I would expect a movement supporting traditional farms to arise, and for this movement to place a high priority on animal welfare. If this happened, I would support this movement by buying farm-grown meat, but this would be a personal preference and I would not recognize a moral obligation to do so.

I would eat vat-grown meat. In addition to solving the animal suffering problem it would probably have less impact on the environment as well.

I might eat vat-grown chicken on an irregular basis, if I were sure that it had no bizarre side effects and that it really was from a vat. Other meat no longer appeals to me enough that I would choose to eat it in a non-emergency situation. I don't think there would be ethical issues with it unless it was staggeringly inefficient to grow.

Assuming I felt like it, it would depend significantly on the efficiency (particularly energy efficiency) of the production process.

I would have no qualms about eating it if I liked it. (I'm not sure whether I would because I don't like meat all that much.)

Here's an ethical issue: what happens to all the cows, pigs, chickens, etc? (Consider what happened to the horses.)