I have a Dirt Devil Illusion bagless vac which also has the HEPA filters to keep dust, pet dander, etc down to a minimum. I love it, it was reasonably priced compared to others ( I think it was $179 but I cannot remember ), and I havent had any problems with it since I got it last year.
I would recommend it to anyone who is looking for a bagless vac. The only thing that I have experienced is the belt needs to be replace a bit more often that other vacs I have had. But they are quite inexpensive ,around $3.00 for a bag of 2.
By the way, it has all attachments right on board, so it is very easy to use and convenient.
Thumbs up from me!!