That all depends on how you have your particular moustache bars set up. If you have the brake levers at the ends, the way Jamis sells their bikes, then they work pretty much as cruiser bars.

If however you set them up with road levers more towards the center


Then you have many more hand positions. More on par with drops than bullhorns. Riding on the ends, where the bars are parallel to the top tube is upright and cruiser like. The hooks are reasonable aggressive, but still give you immediate access to the brakes. The hoods are really comfy and good for long distances, and then by the stem can allow for an aero style tuck.

Much better than the simple 'horns or flats'