Mac makes some very good points!
For my own part, I purchased the device myself when I first encouraged my wife to cuck me (as a fetish, not a lifestyle). She was hesitating, so I bought it and told her she wasn't getting it off me until she cucked me proper! LOL I was teasing her, and she knew it, but she finally went out and got herself some strange and when she brought her puffy well fucked pussy home, she unlocked me and unleashed the lion so to speak! I do not govern when or who she decides to fuck, and as a rule we always discuss the pro's and con's of every encounter. No secrets from each other.
Since then, when we find ourselves in a rut, she will wake me up one morning and lock me in without explanation. From there it is anybody's guess how long I will be locked in. Usually it is until a situation presents itself for her to get some strange. Sometimes, it is just until she builds up enough tension that she becomes overwhelmed with a need to dominate me and she gets rough, paddles, strap-on, etc. I enjoy it all so its all good.
She giggles knowing that I have it on, day and night, around family and friends (who have absolutely no clue), and especially when we are out and about. On rare occasion she will also make me wear a small stainless butt plug and a pair of panties under my cloths to make sure everything stays secure.
So that's me in a nutshell (pardon the pun). As far as hygiene, when I piss I use a wet nap to clean myself and my equipment. I shower every morning and night and lather my equipment generously. I have never developed any "nasties" as a result of wearing it for extended periods.
She has told me that she may give the key to someone else to hold, without telling me who, which sounds scary and exciting at the same time. I am just your average Joe, just shy of 6" long when hard, with fair sized (my wife says large) balls. When soft, I shrink up nicely and do not nearly fill the cage, but damn it hurts when I get excited! LOL
Long before we met, I was intensely trained as a submissive slave by a Domme for several years before assuming my more dominant role. So now as the Alpha, it helps keep my perspective to give her complete control once in a while. Some would argue that I am still the puppet master, and to a certain extent they would be right, but I know what goes on in my own head and when I make up my mind to give up control, I do so completely.
Sorry, I started to ramble. Does that provide enough prospective? I would love to hear from anyone else who actively uses these devices.