The Dirt Devil Reaction boasts "dual action cyclonic suction". The cyclonic vacuums that were made popular by Dyson are designed to be able to maintain suction over time. This keeps them from getting clogged and losing suction. The Dirt Devil is less expensive than Dyson too!
According to the customer reviews on Amazon, one of the most common complaints for the Dirt Devil Reaction is its poor suction. The expensive Dyson is cited as an alternative.
Dirt Devil's are reliable and will last a while. Going with a higher price vacuum cleaner will get better quality, a better investment than going through many cheap vacuum cleaners.
The dirt devil vacuums are the best vacuums out there. I know people who have had some vacuums for years and say that they are great. The reaction has nothing but great reviews.