You'll love it.
I got mine last week and is more than I expected. JellyBean is great and so fast! I only rooted it, I haven't flash custom ROMs. By the way, remember to unlock the bootloader before starting to personalize it, so you won't lose much.
Now there's three things I don't "love": lack of micro-SD card slot, 5mp camera, which isn't too bad and low speaker volume.
But nothing is perfect and I still love it, and I think I won't ever get any other device that is not a Nexus!
Sent from my Galaxy Nexus using xda app-developers app
Device: Xperia Pro MK16a
ROM: Xperia Ultimate HD 5.0.1 - 4.0 | Kernel: Stock
Device: Galaxy Nexus GSM
ROM: AOKP nightly-10-31 4.3 | Kernel: LeanKernel 8.3exp1-180