I can say without hesitation that IOS5 works better than 4.2.1, 4.3.X. I kept the phone sharply due to the animations, slowdowns, etc in the software versions 4.1. IOS5 works perfectly in iPhone 3Gs . It's very smooth, animations are smoother than 4.0. The notification center is lowered perfectly. Smooth open folders I've seen. In general, it works perfect. Maybe people who have had problems just got a bad installation or something. I've had nothing but good experiences with IOS5. As always, be sure to close the application from time to time as the iPhone 3Gs has limited memory.
However, I would say if you're a iPhone 3Gs s user, you should upgrade.
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