A chuck expands the possibilities of the Dremel enormous and provides a bridge to the use of areas where you do not necessarily need a high-speed tool, and where that is likely second choice.
The chuck is of very good quality and a very useful accessory, and therefore receives from me 5 stars. Rate for the purposes of comparisons with other products I'll's but can not: Because there's no fact. For a monopoly product one has mE made this a lot of effort, and delivered good quality.