I'm not an expert on this, but I don't think there is any way of permanent size improvement with things like this.

For as far I heard there are only two ways (But I'm not sure about the first. Maybe other members can clarify?):

Either by loosing weight, or more precise the fat stored around the cock's base to give it more room to come out.
Or by surgery.

Hello, I am using a pump now with the hopes that if i ever get an erection again it will be just as big as before. Had a prostatectomy a year ago. I think it did me in. The dr said to use this. So I am . It feels good to get hard. But it does not last for me. I t may be a combo of age and operation.

To answer your question, I think it may increase your girth- a little, don't think it help the length. Is if does it won't be much. That is just what I see ut it looked so unnatural, like you said, I decided to delete them.
I would not spend the money in hopes of increasing your size.