If you are curious about testing out the new Windows 10 you can install Windows 10 Technical Preview in VMware Player 6.0.3. This was a very easy install you just need to configure VMware. First I used the X86 version of the Windows 10 Technical Preview. Second when configuring VMware I selected Windows 8 and the guest operating system and gave it 1 GB of ram so it would perform better. Other than that I limited the hard drive size to 30 GB as I am running out of space on my desktop. After that I installed the VMware Tools which helps a lot.
I did notice one Unknown Device in the Device Manager and I could not find out what that is or find a driver for it. If anyone does please post it on the comments. It was easy to install Windows 10 Technical Preview in VMware Player and I imagine just as easy in VMware Workstation. This is also a great way for Windows XP, Vista, or 7 users to check out Windows 10 as Virtual PC does not support Windows 10 that I can find so far.