Our Dyson DC37 we bought this flexible parquet nozzle. It is much narrower than that for vacuum cleaner nozzle delivered and thus to get skewed in very narrow niches. The joint simplify this procedure even further. Also on tiles and other smooth surfaces it is ideally suited. On carpet it does not work so well because they always back and forth tilt. Seriously, it's not even provided.
Conclusion: This accessory is an asset to any Dyson owner.