Yeah oddly enough the most glitchy thing I've run into has been the new start menu. Sometimes when you press the Start button, it doesn't come up for me right away and I have to press it a few times. I was considering putting Windows 10 on a 2-in-1 tablet PC but now I don't think I will for another few months. I'll continue updating it and monitoring the progress on the VM until I feel that it's stable enough.
The Start menu works well for me. The biggest glitch I am experiencing is that the recycle bin won't empty and it takes many seconds for the confirmation dialog to come up after right-clicking it and telling it to empty.
Plus the 2560x1440 resolution is absent from the latest build so I had to go way down in resolution to fill up the 27" iMac screen.