Ok so I went there again, and I am very happy to see Isaan Der has pulled itself together.
The management was much better this time, and the servers were more attentive.
My girlfriend thinks their Pad Thai is the best(better than Pai and KSR). It may or may not be the best but it's definitely very tasty and has a unique touch to it.
They Also have something like Khao Soi but its under noodles and called something else, it was also very tasty.
We have found ourselves a new good Thai place and will definitely be returning.