As of this morning, I've owned my MM JB for 185 days, and have been lockd-up for 130 of them. Longest period locked was about 2 weeks.
But are there any drawbacks to the jailbird? Apart from the obvious such that u can't go through metal detectors with one on.
So here's been my MM JB experience:
- Hygiene: No issues whatsoever. As stated, soap and water keep it nice and clean. Completely odor-free with daily showers.
- Fit: Get it right the first time. "Home handymen" can't adjust it the way you probably can with a plastic device. MM sells a ring set to help you get the right base ring size. I didn't buy them because I didn't need to after wearing a home built for a long time.
- Durability: Stainless steel, prefectly-dressed and finished welded joints (bars to rings, etc). Need I say more? I've read some sources that state the CB-XXXX series tubes tend to split after a while.
- Weight: Almost not even noticable after about a week.
- Comfort: See "Fit" above. Most days I don't even know I'm wearing it, unless I move around. Even then, it's just "there." Open cage design permits air circulation and minimizes chafing / moisture buildup. No fancy tricks (like the stocking trick) required to don the cage. A little moisturizer around the base ring every day after showering ensures no base ring chafing, hot spots, or other discomfort.
- Security: As a ball-trap-device, it has all the benefits and drawbacks of that style of MCD. If the cage diameter is too big, pullout could be an issue. As discussed in at least one other thread, it's difficult to find a lock that will lay parallel to the long axis of the cage. Most will be perpendicular. At least one company may have a smaller lock, but I've never bought one. The hasp diameter of a small Master lock works just fine if the perpendicular lay of the lock isn't an issue for you.
- Airport security: Stainless steel. Nuff said. I travel a lot, and am uncaged when travelling - "honor system."
- Price: ~$300 for the basic model, but check the MM website for latest pricing for the cages and various options. Haven't done a LOT of research on custom-fit metal MCDs, but this is probably typical.
- Delivery from order: Mine took roughly 6 weeks. eMails from MM suggested that this is typical. You don't just "go down to your corner adult store" and buy one off the shelf.
- Visibility under clothing: For me not an issue. I never wear "tight" clothes, so appearance is never an issue, and I check every now and again with a full-length mirror in our bedroom. Mama says it isn't visible.
- Temperature control : When you first don the base ring after it has set out overnight in a cool / cold bedroom, after you've just gotten out of a nice, hot shower, be prepared for a "shock." Stainless gets COLD!

Ditto the cage... It warms up quickly enough, but it gets your attention the first time you do it.
- Ability to sleep: I tend to sleep mostly on my side or on my stomach. On my side there's no issues whatsoever. On my stomach, I can feel a kind of "pressure" in my groin area as the base ring presses uniformly into my crotch. Rather pleasant actually...
- Comfort with long-term wear: My longest period locked up has been about 2 weeks. I've encountered no issues whatsoever with chafing, rubbing, soreness, ANYTHING in fact. I have no reason to believe that if Mama wanted to keep me locked indefinitely, she could and there would be no physical issues (at least with the cage). My head would probably explode though...
My overall impression?
I'm happy as a clam and would get another JB in an instant. Outstanding value for what we spent. I can reasonably foresee being locked in my JB for YEARS to come (no pun intended).
Hope this helps.
Various home builts for almost 2 years. Current: Jailbird since January 2013.