A Host can't run silent. It has things to do!
This is just plain incorrect, Wak. Both published source books and adventures indicate or flat out state that hosts are capable of running silent.
For all intents and purposes, there is no “physical” distance to any host in the Matrix. You can always spot a host from anywhere on the planet without a test, assuming the host isn’t running silent.
The Data Host is also the more obvious of the two, as the entire Security Host is running silent. To spot it, a character must succeed a Matrix Perception test versus its dice pool of 14. However, the Security Host (and all IC on it) receive a –2 dice pool penalty to all actions due to running silent.
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Switching topics for a minute, ouching on Chrome Flesh. You mention toomuch fluff. I'm just going to assume, based on teh rest of the statement, that you'd have ripped out the CFD part. WOuld you say, minus that, that it was an acceptable ratio, or is there more that you'd yoink? (I have a pretty good idea of what people wnate dto add, mind you.)
Chrome Flesh suffered mostly from lack of good editing, in my opinion. Where Rigger 5.0 did this well, Chrome Flesh did it wrong. Just a single-page ToC instead of a proper, bookmarked index; no clear separation between fiction and rules (coupled with the former); rules and tables being way too separated making flipping back and forth required for pretty much everything; the entire custom drug chapter (though this is also content, not just editing).
As far as content goes, I always felt the fiction should be in the fiction section, and the rules in the rules section. With the above comments about editing, Chrome Flesh is a good example of how poor layout exacerbates an issue some have with mixing fiction and rules. Fiction is great, but when it comes to describing what a piece of gear actually does I personally want more mechanics and less fluff so that I can actually know what it does without having to guess or extrapolate.
I also wish there had been more substance to Chrome Flesh instead of yet more pages on CFD. We've already got Lockdown, and Stolen Souls, and Data Trails with heaps and loads of source material on CFD; I would have preferred even more advanced medtech rules beyond what Bullets & Bandages and Chrome Flesh already dealt with (like diseases and pathogens, biodrones, cybermancy, and full-on cyborgs, actual honest-to-Spirit rules on upgrading cyberware (!), and so on and so forth).
Not for nothing, but I've kept my 4th Edition books close at hand because for every book that's released for 5th a bunch of equivalent content that in my opinion should have been included in the 5th Edition releases keep getting cut. Then again, the same happened from 3rd to 4th, so I'm not hugely surprised. I just find it harder and harder to justify spending money on books when they contain less substance, if you'll excuse my bluntness. Fiction is nice and good and all that, but there should be a distinct difference between a core rulebook, which in my opinion should be decidedly heavy on the rules, and a setting book, which should be heavy on the fiction.
As it stands, Chrome Flesh at 242 pages doesn't stand up well to Augmentation at 178 pages, when the former has 85 pages of (mostly) hard rules (I say mostly because there's a ton of fluff in between the actual game mechanics, and I don't count the 16 pages of repeated tables at the end) or just around 35% actual rules, while the latter has 83 pages of actual hard rules (again, not counting the 11 pages of repeated tables) for more than 46% actual game mechanics.
Yes, I counted. The point needed to be made, if nothing else

Misunderstand me correctly, though; setting aside the editing, which is just frustrating, the content that is there is good. I just want more of it from a book that retails for $25; I get that fiction may not sell as well, but as someone who's bought every book Catalyst (and FanPro before them, and FASA before them again) ever released for Shadowrun, I'm sure you can see my point of view as well.
Again, fiction is all nice and good, but when I buy a rulebook I expect rules, and hope that they are clear and concise. Simple as that.