I've been taking gabapentin on and off for years.
They put me on a very high dose in rehab. I saw my external psychiatrist 3 weeks in and she thought it high. 3600mg/day, I had taken a max of 900/day before for various reasons. It helps with anxiety without giving me a "buzz" (unlike benzos) and I was coming off of 5 bottles of wine and 3mgs lunesta (sleep aid) a day. I had no issues stopping it, I tapered it after rehab.
I've read some stories about people becoming dependent on it or having a tough time when they stopped, but personally I never had any of this. It was pretty innocuous and helped me sleep. I did get some swelling/fluid retention in my legs.