I don't believe that GH is responsible for the guts that you sometimes see on stage. I believe that is more caused by insulin and high amounts of food. If gh is playing a role in this issue, it would be at high high doses. If you take 3-8iu ED, I don't believe you will see this problem. For me, gh alone makes my stomach smaller, tighter, ect. Its when I add insulin that I see my belly pop out. But watch your body. If you see changes that you don't want to see, back off the dose. 

GH alone is not going to be a great muscle builder. You will want to add it to a steroid cycle in order to get the best results. The effect is slow, and will take months. I would use it for at least 6 months, more if possible. Start with 2iu and work your way up to the dose you can afford to run, adding .5iu every wk wks. For a first timer, 4iu or even 5iu should be enough to see good results with a cycle of test. It will also help you to maintain fullness while off of your gear. I would suggest hyge GH to get the best bang for your buck.