There are a ton of different situations for Jailbreaking and using installous. Blindly putting a bad label on it is just ignorance.
Personally:
- I used installous for trying apps out since there is no "demo" mode on most apps. Particularly the more expensive ones. Once you buy it your stuck with it, for better or worse. NO THANKS!
- Disabling the stupid password feature on FMF
- Tethering (I use Page+, so it wont register tethering correctly)
Those items for me are deal breakers. Ive been a diehard mac person for years and I still am, with dozens of iPhones in the family. BUT personally, without these two items (JB & Installous), I won't have an issue going to Jelly Bean. iOS has really taken a dive in my personal opinion with limiting the ability to do anything. Sadly, I feel that iOS has not progressed with the times....