All my morning training is done fasted. I usually have a cup of coffee on the way to the gym and then just hit it. I do recommend taking an extra couple minutes to stretch a wee bit more than you usually do.
I didn't see a drop in weights, but I found that you do have to dig a little deeper to find that same intensity you have if you're used to training in the evenings. If you can persevere through the first couple workouts and find your inner drive you'll be just fine.
Class I Total @ 198: 525/335/600 (1460)
"No citizen has the right to be an amateur in the matter of physical training.... What a disgrace it is for a man to grow old without ever seeing the beauty and strength of which his body is capable."