I am intrigued by them .. but until my Oreck dies I'm not buying one
I like the light weight of my vacuum and the handheld is awesome that came with
One thing to consider before investing in a Dyson is that they are almost exclusively made from plastic which, in the industry, is thought to be inferior to those with solid metal parts. I am retired from a long time position in maintenance where as part of my job I purchased vacuums for a large school district. I can tell you I would never recommend a Dyson vacuum because they don't hold up to normal wear and tear.
Although most folks don't need to spend the extra money to purchase a commercial vacuum for home use, it generally is more economical to by solidly built equipment over something that is primarily a gimmick and generally cheaply made and probably won't last more than a year or two.
I am not a Riccar salesman. However, although Riccar vacuums are not commercial vacuums they are well built and will hold up for many years of home use. I had my first Riccar for nearly twenty years before I traded it in for a new model. It still worked well, BTW. Riccar vacuums are not cheap by any standards, but they are less expensive than many commercial vacuums, such as an Advance. For more information about Advance commercial vacs, go here:
http://www.advance-us.com/products/vacuums.aspx I previously posted a link to Riccar in this thread, please refer to that post for more information about these vacuums.
Another great option is to by a quality used commercial vacuum over one of the new throwaway ones.