I keep mine on 24/7 and charge it every night. I mean, why NOT charge it? Anyway, I guess I am in the unusual circumstance that everyone I meet IN PERSON who owns a 4s (quite a few so far) are all having the "battery issues" - in fact I have yet to talk (in person) to a single iphone 4s owner who even knows someone who is NOT having battery issues. So, in my admittedly limited sampling, everyone who is not having battery issues seems to be here at this forum lol.
All that said, I have had smart phones for many years now, and I always leave them on 24/7, and charge them every night (if I can start the day with a full charge, I just feel better for some reason). But some people turn theirs off at night - and others only charge every other day or something like that. Smartphones are great, and their use will vary greatly from user to user.
Take care,
Rob