Made my jump to AG using BIAB about 6 months ago and am loving it. Being a geek, I was full set on building up a three vessel system and stand until I heard about BIAB and decided to try it first. About ten batches later I don't see any need now, or possibly ever, for a three vessel system. I love having to only clean one vessel at the end of the brewday, and the overall simplicity of the process.
And my geek tendencies are still being fulfilled, I just finished up building a gas fired RIMS system that's basically a clone of the Tower of Power....