Hi searcher, just wanted to chime in to clear a concept that in my opinion is overweighted:
Erection firmness.
Unless you are going to pump it up with LOTS of product (
PMMA, Ellansè,
HA or else) there is no "firmness" problem with any.
If you start with a naturally strong
Erection, you'll just have a small layer around it, as it is already in a non-enhanced penis.
Nobody will notice the difference but yourself.
Problems may start when you are aiming to go from below average to "porn star" and this by adding more than 1" circumference. In that case of course the inner layer is much thicker and you might want a firmer product.
But rememebre also that you're not living in a permanent
Erection, and if you want a natual looking penis even in a
Flaccid state your product should be soft and malleable like in a normal penis