No, not reliable. I've never owned a worse laptop than the 8790. I've had to RMA it 5 times so far, and right now it's sitting in a box waiting to be shipped to Micromedics for the 6th time. GPU overheating and causing unbearable artifacts, motherboard so borked that the computer wouldn't turn on, screen that would represent black colors as red depending on the screen-body angle. Oh, and my 8790 was outperformed by a Dell laptop that didn't cost more than half of the Sager, bought that same year.
The 8790 was absolutely fine for the first 6 months, then its artifacting became intolerable. Sager doesn't seem to be a brand that cares much about long term durability of their laptops.
If I ever had to buy a high performance laptop again, which I really doubt I'll ever do because of their clearly inferior performance compared to desktops, I'd go for a XPS, NOT Sager.