I visited numerous Threat 0 DE USSs - there were a lot of them - in Wregoe XQ-L CC21-29 this afternoon. I got one toxic waste and a couple of manufactured mats, but the majority did contain Guardian mats. The number in each Guardian USS varied considerably, from the three drops illustrated above to as many as nine.
Good to know indeed - I've never seen 9, but that is RNG

I would still say that given the RNG on the mat count, the RNG on the USS content, the time taken to deal with pirates and the SC time between USS it is far faster and easier to just go to a surface site. Each 'spike' will give 3 guaranteed drops, so you can get a lot of mats. And some sites you can avoid spawning Sentinels completely (if you care, they are also a rich source of mats).
If the USS were in the bubble so I could just drop in on them to top up mats - fine. Given you need to travel 400 Ly to a specific system ... I'm less convinced I would use them for the CG or afterwards as a mat source.
The CG has not started. I'm sure there will be more information in-game when it does. This thread is an attempt to avoid some of the incoming salt when people find how (relatively) difficult and (relatively) unrewarding the new content is when compared to existing surface sites.My Feedback so far:
1) No Galaxy wide advertisement of the event or its goals, as neither the Galnet article on the new megaships talks about an event and the usual place to find info on goals, the Community Goals section of the Mission Board, remains empty. This needs to be fixed immediately, as people who are not forum members will not find this event.
2) Galnet articles on the event do not provide info on the event's requirements or the event's rewards. This needs to be fixed.
3) Galnet articles are not providing an in-game link to system in galaxy map, which is something that the in-game Galnet is capable of doing and has demonstrated its ability to do so in the past. This needs to be fixed.
I look forward to your in-depth report once you find the nearest shipyard (nearly 200 ly away) and nearest Interstellar Factors (also nearly 200 Ly away). A report based on experience would be welcome, I may have missed something, I often doThere are ways to get round point defence and legal issues when Pirating.
I'm heading out at the weekend. I take it there is a place to transfer ships?