Should i upgrade my iphone 4 to iOS 6.0.1?

Iv been scared to upgrade my phone to iOS 6.0.1.Is it bad? Will it screw up my phone in anyway? Shall i?

I upgraded my iPhone 4 to iOS 6.0.1 yesterday and now it doesn't work at all. It's now stuck on the "Connect to iTunes" screen but iTunes either says to insert a sim card into the phone or it literally says "There's something wrong with your iPhone". I have to take the phone to the Apple store tomorrow to get it fixed. It was working fine before, now I regret having to go through the hassle.