I love, love, love my vacuum. Yes, I felt like it was an insane purchase. My good friend and one of my neighbors has one and I had vacuum envy because they both talked about their wonderful vacuums! (the neighbor's vacuum is 9 years old and my friends is 4 years old.)
With two children and a dog that doesn't shed, I was still averaging a new vacuum every 3 years. I've had Sharp w/ bag (easy enough/not great) hoover windtunnel (w/bag).. pretty good; Hoover windtunnel / bagless (absolutely the worst vacuum I ever owned - and it cost almost $470! Lost suction very quickly! I was constantly dumping the canister. Why did I want to keep handling the dirt? It's my biggest problem with bagless.)
Considered Dyson and have heard wonderful things about it, but again, I didn't want to go through the bagless thing again.
Just for kicks - Kirby called me and offered to vacuum/shampoo 2 rooms. I accepted their offer. I wasn't wild about the weight - it's heavy - 25#. Nor did I want the shampoor - seemed cumbersome. Also, had to adjust to adding / removing attachments. Also I need to vacuum at least 20 stairs, with ease.
I bought a Kirby!!!! No, it wasn't a hardsell - the guy even left the vacuum overnight and I vacuumed every square inch of my home, including drapery and blinds - using a special attachment, before he returned the next day. Added longer hose - comes with Hepa filter bags. When I have company, I can even blow up air mattresses with this thing because it acts as an air compressor. Did not get the shampooer feature and that saved me money. No longer do I watch dust stream through the sunlight in my home - something that I just accepted. It is AMAZING!!!!!! I use it on hardwood, on tile, and three different carpets (berber, dark colored low pile and frieze carpets). It's been well over a year and it works as good as new!