Thinking of upgrading to Galaxy S3 from iPhone 4, need advice

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http://forums.androidcentral.com – I currently have an iPhone 4, but I've seen the Galaxy S3 and can see that it is a lot better than the iPhone in many ways. I'm due for an upgrade with my carrier so I was thinking of switching to the S3 / Android platform, but I'm a bit worried to switch for some reason. I wonder things like - will the S3 be laggy, will it be reliable and easy enough to use, etc... If I don't get the S3 I'll probably upgrade to an iPhone 5. I've been comfortable with iPhone so far and is why I'm having doubts about switching to android / Galaxy S3. Any advice is much appreciated. (HowTos)