One of the original reasons I chose XNA as my development platform was for the benefit of Xbox builds and debugging. With my original choice for network library I was unable to run it on the Xbox. Thus it was one of the ancillary benefits in my choice to change networking libraries.
I've been working with an Xbox build (of the game that I've been working on for months) for a couple of days now and it's been great for debugging network code already. Doing remote debugging of an Xbox build in Visual Studio is pretty amazing every time I do it, and I know that the XNA team at Microsoft put a lot of work into that. It's quite interesting to set breakpoints for the Xbox build or to do post-mortem debugging.
I was asked to take a few photos of the Xbox build in action and I decided to go ahead and share those on my blog as well, because I do feel at a decent point to brag about where things are, to put things in perspective compared to how the rest of the time I end up worrying about where things need to be. I apologize for the quality of the photos, I only have a cheap digital camera at my disposal, and the angle of the photos (I couldn't find a better way to reduce glare and I couldn't turn off the flash without losing the camera's auto-focus apparently)... I am not a professional photographer.