If it can get you in trouble at work, then no, I wouldn't do it. But is it worth it if you won't get into trouble? You bet. Put it this way, if I couldn't jailbreak, I wouldn't have an iPhone. Jailbreaking allows you to fill in most of the gaps that apple missed. If you decide on jailbreaking, some of the more popular jailbreak apps are, sbsettings, lockinfo, bitesms, categories, 5 icon dock, mxtube, my3g, and I blacklist. There's a lot more, but those are some of the more popular ones. I especially like bitesms. Also, I dont really experience any "slowing down" of my phone.