I have a Dyson V15 Detect. It is 100% NOT a BIFL product, but with a bad back, the thing has been a lifesaver. Of the vacuums that were available, it had some of the best suction performance, and this was necessary because I am often vacuuming up hay, which it can handle, but is also light. Functionally, it works very well, the heads are very well designed, and it has extremely good battery life (+ a replaceable battery). Realistically, I expect around 3-6 years of service life from this type of product. If I get more, great. If not, this vacuum will have saved me a lot of back pain over the duration of its lifespan. Lupe is definitely worth consideration as well. (I ultimately went with the V15 due to the weight difference.)