I went for the first time this weekend. Really enjoyed it.
They have two menus - as best as I can tell, one menu with a mix of more Americanized options and other more traditional items, and a second menu with more Issan-style options (they hand you two supplemental menus, but I was told that they're the same menu, just one in Thai and one translated into English).
Here's what we had:
Duck rolls - excellent - regular menu
Papaya salad - great - Thai menu
Goong Gleur - flash fried shrimp and vegetables - stellar - regular menu
Nam Khao tod - crispy rice salad with pork - excellent - Thai menu
Sai oua - Issan-style pork sausage -- good - Thai menu
Pad prik khing moo crob - fried crispy pork - very good - Thai menu
Mango sticky rice - great - regular menu
This was my first time out to this part of Springfield. Looks like there are other good options around there. Will be back to visit Karahi Kabob, which gets great reviews, and eager to try what was seemingly a Pakistani place called Dera.