The first thing you have to do is make sure that you have a text to voice generating app such as "IVONA Text-to-Speech HQ" which they recommend on their page. This is the one that I used and its quite good as the basic female voice.
Next you can choose either the YES/NO board which is instantly available, or create your own 3x3 board.
There are only a few slight issues: there is a little distortion of the pictures if they are not the same size as the tiles, but my kids didn't seem to notice this. I could have done a little cropping and made them fit better, but they worked well. Each button is large and when pressed it says whatever text you programmed. It has the capability to store up to five boards that you program, I did notice that sometimes when switching between back to the first grid it will show the pictures as very tiny, if I hit the home button and then go back in this immediately corrects itself. This may just be an problem with my tablet, and the other grids appear to load just fine.
This is a very easy to use app that is great when you need something quick, or something that parents can easily use at home. It is very simple to edit and although the grids are static, there is a lot of versatility as you can choose to put buttons on any or all of the spaces. The YES/NO board is also simple and quick to use making it very convenient when working in therapy, or if parents are out with their children. I love that you could quickly take a picture and add it in if new choices or objects were around, very good for when our clients are out in the world, or when the therapist needs to add something quickly.
Overall, very good app that is easy to use and does its job well with a few small bugs that are easy to get around. If issue of switching between grids were fixed (may just be my galaxy tab) and there were a way to crop the pictures first it would be perfect! I highly recommend that you give it a try.