You say why wait. That's as opposed to what? You can still sign up for the Insider Preview and download the 10162 ISO, install it in a VM or separate partition, and examine it for yourself if that's your preference. This build is not going to be the RTM one, but it's only a few days old, so it's close. It's not 100% bug free but then the RTM version won't be either. When Windows has hundreds of thousands of instructions, there's no way for MS to've tested all possible combinations of hardware and software on 2.5 billion computers.
Personally while I've installed the preview version, there's nothing I've seen in Windows 10 that would make me want to convert my main Windows 7 systems to 10. If you're looking for more info, you could read the FAQ here:
Why wait for Wind 10 before downloading it to make sure the bugs have been all been corrected when updates will take care of bugs?
computer system(as of 6/12/14)
operating system :wind 7,ultimate
ram = 4g,chrome+explorer browsers
cd-rom 16x&cd,+ burner
apc surge p
processor: inter core i5-2400 email@example.com 310ghz
memory: 931 GB
dell ultrasharp u2412m 24-inch widescreen flat panel monitor