Yup, I'm caged. I have been diapered 24/7 for many, many, many years and caged 24/7 for nearly a year now (apart from taking off for cleaning every 4-5 days).
Before this past year I would self-lock for a few days off and on. But always wanted to be 24/7, and I guess this past year it just "stuck". Two main benefits:
1) It keeps things pointed the correct way (as others have said).
2) It means I can enjoy being diapered in a long-term, "pure" way. Before being caged I would often self-pleasure, and in a weird way that kinda ruined the diaper experience ... I would be sort of disgusted with myself for pleasuring. Dunno why, but there you have it.
I use a CB6000s. I have tried other cages, but always return to the CB6000s. It's light, and I like the transparent slightly clinical look. I find it perfectly comfortable. Most of the time I don't feel it at all.