We had it setup for FTC this year and had it mapping a room and objects in the room. We didn't have time to finish it for the field but are considering it next year. We were using an STM to capture and display the data but planned on moving it to i2c so that we could process the data in the phone. We actually used an Neato sourced version of this but I'm sure it would work the same and we believe it will provide invaluable data.
Tried to a few years ago, actually had a full field-position and some degree of autonomous navigation, but that year it was specifically banned on the basis that it has a non-first approved motor in it. I would ask in the Q&A this year, though, this was (apparently) developed in part for FIRST, hence the $400 price point.