Help?

[MerlinsShadow]

I am not sure if this is the right forum for this, so if it is in the wrong place please move it to the correct one. ANyway I just got a Verizon 6700 and I would like to know what the benifit of a custom rom is, and should I even bother with it, and if i should can you tell me what it would do and then which one would be best for me. I would be very greatful for any help thank you very much.