As someone who uses a tiny netbook, Windows 8 significantly faster than windows 7 in terms of startup and shut down. It's also faster in terms of internet browsing. Honestly, if you can work a smart phone, you can work a Windows 8 computer. It's really not difficult. However, the little edge in speed isn't really a reason to upgrade to Windows 8 unless you're like me and a tiny bit makes a huge difference. Also, I haven't had an audio issue with Windows 8. The only thing that's been a real pain is the resolution of my netbook not being compatible with Windows 8 apps. If it's really bothersome, just downscale the resolution. The image is a bit fuzzier, but you won't be bothered by incessant pop-ups saying that your resoution is too low to run an app. Hopefully, Windows Blue resolves this issue altogether. Regardless, I look forward to seeing the reviews on Windows Blue.
Btw, I don't really want to run the Windows 8 apps... I just really hate that pop-up when I try to open Chrome.