I don't know much about Sagers, but from reading multiple threads that include Sagers, I've heard good reviews.
That's a great steal, but it's in a different price range than the cheaper Y510p models.
I also noticed that the base price doesnt include an OS (WTH??) So if you want to add a windows 8.1 OS to it, you'd need to pay an extra $80.
Btw, don't forget tax