First time testing an OS X pre-release.
Since a very significant amount of my activity is online, the inability to get onto the internet (I have wireless access exclusively), means that my use of Yosemite is compromised.
There was a brief exception last night, when I was able to connect at every access point (including home), took advantage of the opportunity to fire off a problem report through Feedback Assistant. Today we're back to Yosemite not finding any networks. (I'm writing this from Mavericks).
Frustrating to say the least, because even as a non-paid volunteer tester, I wanna do my duty and report, and I wish Apple's OS X development team had a "side door"/"plan b" path of reporting for cases of internet connectivity problems. (And when it's in full release, a large amount of 10.10's user-base will be on portable computers, connecting via hotspots).