To add my two cents to this discussion. I am in Jennifer in Control since more than 2 years, with one break in between. I have set a limit for sissification, and it simply does not show up in any tasks for me. Perhaps years back this was different, but nowadays I can confirm that JIC is equally, if not more, good for people seeking other forms of BDSM.
Two of those as example. There is quite a lot of functionality in the system to control chastity lock-ups. As long as you have a working chastity device, and you are willing to spend a few dollars on metal one-time tags, there will be little chance to cheat as any lockup, unlock etc will be carefully monitored, foto documented, and goes through peer reviews that somebody has mentioned in this thread before. The rules in the system are very clear, there is zero tolerance for cheating with chastity, it leads to exposure. And over the years I have seen quite a number of slaves becoming a bit more public due to their failed chastity. So, if you look for a way to make chastity real, JIC might be good one as long as you don't have a keyholder living in your area
The second one is that the users in the system form an active community. There is a lot going on in between slaves (setting each other tasks, creating new tasks, there is a very active discussion forum), AND the system allows dominants to enter as what is called "external masters". A slave can lock his or her account to such a master for a period of time, which means that this master now can see any (new pictures) of the slave, can assign tasks, set the "mood" (this is an internal currency in JIC, if that mood falls too low the slave will be exposed). The significance of this arrangement is that, while you may not be ready to trust the external with compromising pictures of yourself, that master has indirectly through the "mood" a way to put the slave under a bit of pressure and push for obedience. I have been myself in such arrangements, in one case that master had me and a second slave doing numerous tasks in a competition, and in a more recent case I was held in chastity for a full month (far far beyond anything I had done before, and much longer than I would have thought possible). She (the master) made it quite clear which pictures of me will end up where if I mis-behave, and required me to edge half way through the month, so it was not an easy ride.
anyhow, my view. To me, the community aspect of JIC is the most important one keeping me active there