Well, to be honest it's not that bad. I stayed on the stable version for a long time, and finally decided to bite the bullet and try Win10 out (again).
The first time I tried it, it was the second build available (the first one you could put on a 1520), and it was just bad. I saw how it was, and said cool.. it's not going to suck horribly, but it's not for me yet. Then I reverted back to 8.1, and stayed there for a long time. Till yesterday to be exact. And that's when I put 10512 on. And as of now, it's decent. You can see some laggy animations, and a few loading screens, but it really got better. And unless you're a perfectionist, it gets the job done.