There are two reasons to use smartpen,
1st is that if you are not good at calculating how much HGH you need from a multi dose cartridge (like 72 IU Humatrope). For example if you need 4 IU somatropin daily you should put 1.8 ml sterile water into powder and use 10 IU with insulin needle to get the amount you need, it sometimes gets confusing. But with a smart pen you dont have to calculate anything. You just set up and press the button.
2nd is that if you are economically comfortable as smart pen is a complicated pen and its disposable, smart pen HGHs are more expensive (like Genotropin)
I am now personally using hygetropin 8 IU to try how they work but normally I would use genotropin myself.
Also some clients are disappointed when they receive their orders but Humatropes dont come with smart pen, they come with sterile water mixer only. Their smart pens are given out (not sold) seperately and I dont sell them as they are given away for free to users with prescription and cant be sold seperately as when they are given out, a doc comes to your adress to tell you how to use it in detail. (I know it sounds crazy but thats how Lilly does in most countries including USA)
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Also genotropin pens are disposable but humatrope pens can be used for a very long time.