I've eaten in at Banana Blossom one time and ordered take-out several more. Everything I've ordered has been consistently good: spicy Pad Thai, Thai Style Basil (a chicken dish), and Coriander Beef come to my mind as favorites. The menu is very extensive, so I'm sure there must be some sub-par offerings, but I haven't come across them yet.
It doesn't look like much on the outside, but it has pleasant decor and is very clean on the inside. It IS off the beaten path in Ohio City, so make sure you use a GPS or have printed directions. I live nearby, so I happened to come across it shortly after it opened, but you aren't likely to drive past it if simply visiting Ohio City.
It is fine for small groups, but I think a group of 8 or more might be a challenge due to the small size.