So I finally got 10049 installed. For some reason I was having trouble upgrading from 10041 to 10049 in VMware Workstation 11 - the upgrade just hung and when it finished after 4 hours Spartan didn't work at all. So I installed 9926 in VirtualBox and upgraded to 10049 and it works fine!
10049 seems to run a little slowly in my VirtualBox VM, but at least I can get it to work unlike in VMware.
Spartan seems to be a nice browser, but some sites, such as this one, don't seem to work great with it. For example I can't log into this site using Spartan but perhaps the forum software being old doesn't help or the fact that Spartan is a beta browser.
The inking capabilities are cool. It would be ideal if I could try it on my Surface Pro and use my Surface Pen to add notes but I don't want Windows 10 on my Surface just yet (I use it every day and it needs to work so I have 8.1 Pro on it) but you can add notes using a mouse which is quite cool.
Looking forward to seeing where this goes and also looking forward to seeing what add ons become available for it! Here's a screenshot:
Spartan on Windows 10 Build 10049 by
ThinkPad Review, on Flickr