sbsettings alone makes having gone to purplera1n.com and clicking 'ok' worth it for me.
If it had been a complicated process, then I wouldn't bother but it literally took all of 3 minutes of sitting here watching my iphone do stuff to itself.
On a somewhat side not though, half the app themes for winterboard haven't worked at all so I don't bother trying to change the appearance of my iphone. But sbsettings and, if you wanna drop a few bucks on a jailbreak app, irealquicksms (or something) are pretty slick.