OVERRATED!
After a broken queue system (where I saw numerous people cut because there's no clear answer as to where the line starts or begins) and a long wait, we sat and began with some drinks: a thai iced tea (good flavor, not too sweet) and PAI Sangaria (quite tasty but maybe a little pricey for what you're getting unless you order the pitcher).
We ended up going with grabong which was interesting and pretty addicting. It was a pretty large portion for two people but we ended up finishing most of it before our other two dishes came. We followed up with the khao soi with braised beef. We both found it very similar to your typical curry but maybe slightly thicker. We went with the medium because my girlfriend doesn't do that well with super spicy but it was essentially mild. Looking back, we should have went a little hotter. The beef itself was quite boring and and tough in terms of texture. Next came the pad gra prow with crispy pork. The texture of the rice was off; dry and cold, borderline stale. I didn't find the flavor and style of the crispy pork to be too different from Hong Kong style roast pig which you could get for a lot cheaper elsewhere.
All in all, I didn't the experience at Pai to be a "bring me back to Thailand" experience. Perhaps it is because I have been spoiled with a plethora of authentic thai restaurants in Los Angeles. To be fair, if Pai was in Philadelphia, I'd probably go more often. If it was in LA, I don't think I'd go as much as I'd go to Night + Market.