I used a BOL Bissell Powerforce bagless a while back, and while I was not expecting it to be a very good machine considering how cheap they are, I was surprised. It did a nice job, had a pleasant sound (IMO), and groomed the carpet nicely. It was also very lightweight, so easy to move around. The only thing I didn't like was the cord was pretty short. I'm sure like most bagless, they are a pain to keep the filters clean, but for the price it was much better than I expected, and the bagged model would eliminate that issue.
I also used to have a Bissell 3-in-1 stick vac in the late '90s. It had a removable handle so could be used as a hand vac and came with the floor nozzle and a crevice tool. I liked it for quick cleaning of hard floors, but again, the cord was too short for me, so I didn't use it much.
So my few experiences have been good.