I forgot to mention one thing. I read a medline abstract that compared SC injections of GH in the abdomen VS thigh. There was a measurable difference in absorption between the two. The abdomen was the way to go.
If you read through all the different gh manufactures package inserts you'll notice that they all give different values of bioavailability (percent absorption) for SC. My guess is that SC inj are very dependant on the conditions at the site. I think some mfg's claim a bioavailabilty in the upper 80% range for SC. It may also be dependent on the concentration after dilution, and or what it was diluted with. If you ignore the differences in concentration and dilutant, I see no reason why any brand would be better than another. GH is GH....
However, a lot of Pro's swear that humitrope is better than serostim, and nutropin is even better than humitrope unit for unit. And they are willing to pay what 3-4 times the price for nutropin compared to a kit.....
Its also my guess that IM would yield consistent absorption results, which I believe most mfgs list to be about the same. So it sounds very possible that some people would get better results with IM, and others with SC.