Sounds good. There are endless variations to the good-morning. Like Hannibal said when you perform good-mornings from a suspended chain (called Anderson Good-mornings or Anderson's) there is no eccentric portion of the lift (much like a deadlift) so the movement teaches you how to be explosive out-of-the-hole (attempting to fire as much muscle fiber as possible instantaneously). I also agree with Hannibal in that the first rep is always the most difficult. Once you break it from the chain or pins you can usually lock it out and get a few more reps.
A few tips for you. If you do good-mornings suspended from a chain then it is easier to get into position at the bottom. If you place the bar on the power rack's pins then it is more fixed and, therefore, more difficult to get into position. You can get a little "swing with the chain to get some momentum when the weight gets really heavy. I like to set the bar at about the navel level. The lower you set the bar the more difficult it becomes to move the weight.
You don't have to initiate the good-morning from the bottom position all of the time. There is nothing wrong with setting up just like a squat and perform both the eccentric and concentric portions of the lift. Just make sure you lower the weight slowly and under control. If you're lowering to the pins or chain then don't let it drop at the bottom. Set the bar onto the chain or pins lightly.
When the weight is relatively light you can lean far out past your toes and really hit the erectors hard but as the weight gets heavy the tendancy is to move those feet up under you so that you can use your hips, glutes and hams to assist in the lift. I try to be cognizant of where my foot placement is so that I can keep the movement as strict as possible for as long as possible. But, when the weight gets heavy I move my feet up under me and use the entire "rear chain" to move the weight. Many times on maximal attempts the movemnt looks more like a squat but as long as you are overloading those muscles then the exercise is affective. Mix it up often with bar heights, foot placement, bands, chains, etc... Good luck!