I've used neurontin for pain and hated it. I was taking less than half the recommended amount and felt like I'd had a lobotomy.
But I generally react very strongly to medications like that. For instance, I take ms contin (morphine) for pain during the day but can't take it at night because it makes me wired. Even Darvocet interrupts my sleep.
My mother-in-law took it for pain and loved it.