I have a Morphy Richards one, very similar to the Hoover one posted above. I have to say, I think they're utter arse. I also tried the VAX one, and that was arse too. With all three models I find that they only work well on laminate for bits of fluff. Anything more than that and they struggle to suck the bits up the tube to the bin. The bits tend to hover at the bottom of the stick in the brush part, so you think you got it up, but then when you switch it off, they fall back out and make a mess again.
And with carpet, I find you have to go over things multiple times or often it just won't pick it up, which is annoying.
So imo, if you're trying to replace your corded vacuum, you'll be disappointed. If you looking for something for the odd *small* mess, it does the job - kindof.
I'm all for cordless equipment as I absolutely hate trying to manage the cords around my wheelchair, but I don't think the technology is quite there yet, suction is a fraction of that of a mains hoover (which is of course to be expected). It's definitely improved over the last few years though so I'm hoping they will have cracked it in the next 5 years (using similar technology as the dewalt 60v setup).