I was taking 800mg pills x2, 3 times a day, along with 20 mg of methadone x 3 a day. And the worst experience I have had with gabapentin withdrawals, was when my company had our annual xmas party in Savannah about 3 years back. I did not pack enough of them to get me through the weekend to it was not a pleasant one at all! The worst for me was that it felt like my skin was crawling severely and couldn't sleep at all.
I decided when I tapered off Methadone a few months ago, that I would taper off the gabapentin as well. By decreasing it slowly, it was never an issue.