UPDATE
So I went ahead and installed Windows 10, everything was smooth. Took a bit of time but so far, so good. Maschine, Traktor, Sonar X3 - all good. Instead of waiting for my reserved copy, I went here:
http://windows.microsoft.com/en-us/windows-10/media-creation-tool-install?ocid=ms_wol_win10 and used the Media Creation Tool. I chose "upgrade this PC now" but I also checked the option of downloading an ISO file. That works too.
I did have a few issues, so maybe this will help others on here:
Nvidia video card drivers didn't work at first.
Windows downloaded the latest ones and tried to install it but it would stop. Turns out I had to go into Task Manager and end each Nvidia process. Then I went and uninstalled all Nvidia drivers that were already installed. Once I did that, I rebooted and then Windows installed the driver. I even went further and downloaded the latest drivers straight from the Nvidia site and installed those.
Fonts were blurry.
Not all fonts, but I guess it really only applied to older programs or programs that don't scale DPI properly. I'm assuming this is something that Microsoft will fix soon in an update, but until then, I went here:
http://windows10_dpi_blurry_fix.xpexplorer.com and installed that program. It's a really small program that gives you the choice of using Windows 10 or Windows 8 DPI. I chose Windows 8 at 100% but since I have a big screen I had to bring it up to 125% (which is what I had previously). The only downside is each time you change the setting you have to reboot.
Overall that's about it. All other programs work. I guess Microsoft will keep putting out more updates to fix bugs like the ones I just mentioned.