I'll try to answer only from my own experience.
The current feeling when hard is almost the same, just bigger. Why? I'll need to explain how it feels when
Flaccid first.
When
Flaccid, over half of the skin around the injected area feels thicker, akin to the sensation of having a pimple or bruise beneath the skin. This thickness extends from the pubic bone to approximately halfway along the shaft. The left side appears normal. However, on the right side, it seems as though the
PMMA was injected more superficially, resembling a custom piece of chewing gum placed under the skin. Consequently, when
Flaccid, I can grip and manipulate this "piece" of firm chewing gum, which exhibits some mobility.
However, when in the
Erect state, everything is compressed under the skin and barely moves, feeling as hard as a natural
Erection. In this state, my wife can't even discern where the implant begins and ends. Overall, I would rate the naturalness of the
Erect state as 9 out of 10. There are slight bumps and it's not perfectly even, resembling the texture of a melon or a cucumber. Interestingly, my wife mentioned feeling that unevenness, comparing it to a typical penis. My rating drops to 5 out of 10 for the
Flaccid state because of what I described previously and because it resembles more of a balloon that has an elliptical shape.
So yeah, if you're in for
Girth and are more preoccupied by the
Erect firmness, going for a combination of 30 and 10% would be fine I guess.
The primary downside I see is that people report a more firm penis when Flaccid, but until this reaches the point of obnoxious
Regarding the firmness when
Flaccid: I don't retract as much as before, resulting in a larger bulge. Consequently, I'm feeling a bit more self-conscious around children (or when I'll be wearing swimwear, I suppose), but that's just my personal experience. Others' opinions may vary.