Dyson gives you the impression of having a very wide range of vacuum cleaner. It is not. 3 large families: sledding, brooms and no son. The various references for accessories, and more bizarre, the color of the cyclone! In the sleds there are the standard and compact with a smaller tank and a little less suction to small house This is a standard gray sleigh / blue with all the characteristics of Dyson products: robustness, ease of use (I have not yet seen the tube lock mode, flexible and simple brushes effortlessly) performance modular suction until "260 airwatts" to the handle by breaking the vacuum and emptying the bag 2 liters easy. And with the same defect noise Total allergy: it comes with a double meaning detangling brush, brush 2 positions parquet, carpet and a long brush inaccessible as behind radiators: very practical. As you know you can find accessories, here's my advice: If you can invest in a Dyson, you will not regret it. Then, after choosing compact sled or not, looking for the best promotion of the moment. Always found it with different accessories that change the name but not the specifications. If several specials, choose the one with the more accessories you interesting. Then you can always competer accessories. One last point: the DC 37C appears to be the successor to the CD 33C. In any case the characteristics are very close.