I'm not sure you should look for it unless you have ASIC farm, but for ASICs this software is great, worth of any cent, tons of options and problem solving rules. Also some pretty good options for GPU and honestly never used it for my rigs except of anrminers.
Is Awesome Miner inefficient in GPU case?
Not at all. AM really shines when it comes to controlling Windows based GPU rigs. With a GPU rig, you have access to many different algorithms, different coins, different mining software, Afterburner integration, and more fine-grained control. Since AM makes everything a module (the concepts of hosts, miners, software, etc.) it makes it easy to mix and match, create templates, and even do profit switching if you are in to that.