A couple of questions:
The tables on Noise on SR pg 231 shows Spam Zone or Static Zone giving Rating Noise. Was that just to save a line on the table or do they actually not stack? It would make some sense for some items (can't really have high grid traffic a long way from the grid), but you could have heavy rain and high grid traffic ? I guess they probably stack, but you'd be unlikely to get both.
What is the practical difference between Tool Kits, Shops and Facilities, for using, say, Hardware skill ?
edit, added:
If you have an agent running on a deck, it can take it's own Matrix Actions. However, if it is attacked, does the Agent defend, or as it's the deck being attacked, does the character defend ?
An observation:
I saw a comment earlier in this thread that the Noise Reduction bonus from Datajacks stacks if you have multiple. I think I'll recommend our GM ignores that. It sounds rather broken from a gameplay perspective, and hard to justify. Having a good route to the Grid help makes sense to reduce Noise. Having multiple good routes should have at the least diminishing returns I would hope, if any effect at all.