The 5.56 AB A-10 is a great can, especially for the price. Considering cost, weight, size, and performance, it's very hard to beat. Its only weakness is sound suppression. It just won't be as quiet as larger .223 cans.
For big-game or predator hunting, where shots are rare, the A-10 is awesome. For prairie dogs or long days at the range, a larger can would get my vote.
The over barrel suppressors are neat, and I'd like to play with them, but for a .223, I believe they are unnecessary. Modern cans like the main ones mentioned in this thread are lighter, cheaper, and more versatile.