Haven't used or owned one but I do believe that some members have posted their experiences with such devices here in the past.
May I be so bold and as what size you are? Are you overweight/obese? This will reduce the visible and therefore usable part of your penis significantly. Commonly referred to as the 'Fat Pad' surround your pubic area.
Most of those gadgets appear to be some kind of stretching device, at least that's what I can make out on their websites anyway. If this is successful, that answer will have to be provided by someone else though, no good giving you more second hand (mis)information than the sellers of those gadgets already do.
One last resort and minor surgical procedure that does in fact lengthen your penis is the cutting of the ligament on top of the base of your penis, though you WILL lose the angle of erection, the ligament is there to ensure it after all. So, this is something to be thought about very seriously before attempting it in the first place.
Lastly, you my very well find that your penis is not too small at all, it may be all in your mind, which it is with a fair few members, even those who are in the average or above range of up to 6".
Penis size begins very much in the head, you know and there are a million ways for both partners to have a happy and satisfying love life.
Right, over to those who are more qualified talking of the issue at hand.
Oh, one thing I'd like to add... don't fall for those silly advertising slogans like 'I am now 8" in size and bla bla bla bla'. The bolder their website advertises, the less likely it is to of much objective substance.
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