Even though I've been told they're the same, brand name Neurontin fucked me up like nothing else (even at the lowish 300mg doese). It was like being wasted on Ambien. Tolerance built up within a matter of days, and the effects became less and less intense until almost vanishing completely (but then I was taking 4000-5000mgs and only barely feeling it, although the negative side effect at this high dose became more pronounced).
Now, I've also taken generic GABA. The couple times I experimented with GABA generic nothing much happened. Smoking weed was a little new and interesting, I might have slept a little better given that it kinda felt like it was relaxing my body/muscles, but I didn't really consider GABA a recreational high (this was at 900-3000mgs).
That is, until the last time I took it, only having consumed like 600-900mgs, I actually got a legit buzz from it. At this time I was and had been sober and clean from all drugs and booze for a while, so maybe my system was more sensative (before I had been also using opioids, benzos, weed, drink, etc. etc.).
Thus, in my opinion, I don't really know. Seems like brand might have something to do with how recreational the experience will be. Furthermore, as I said, although people have told me they're the same thing, the high from brand name Neurontin and generic GABA felt very different, although both within the realm of the more mild CNS depressants/sedatives/tranqualizers/anxiolytics (i.e. something like kava).
Bottom line: Don't expect it to blow you away. It just isn't that powerful or mind altering of a drug. Nonetheless, although I am not included in this group, some certainly do enjoy it as a rather mild mind altering chill out sort of drug.