I've went through a few different heaters in my time, in the last year I have used 3 different fan heaters and TBH there is a huge difference, and it isn't just about spending more money.
Got one like this from pound stretcher
Ex-Pro® 2 Heat Setting 750/1500W Thermostatic Energy: Amazon.co.uk: Electronics absolutly rubbish, if your not standing in front of it don't bother.
Got this from john lewis
Bionaire 2200w Digital Fan Heater: Amazon.co.uk: Kitchen & Home doesn't rotate but can set the digital thermastat and just let it do its job, it takes an age to heat a room to the desired temp though. I'd avoid just not as much as the one above.
De'Longhi Retro HVR9033 Fan Heater - 3 Kilowatt: Amazon.co.uk: Kitchen & Home This little beauty is awesome though, in a different class to any other fan heater I've used. It gets a (huge!) room to a temperature fast and has a dial on the back for a thermostat, unfortunately it isn't labeled so its a case of once you get a comfortable temperature turn the dial until it goes off, then it will only come on to maintain the temperature. The speed/effectiveness of the fan is the important thing on a fan heater the element just heats a cm or 2 around it otherwise, this one isn't too loud either, probably less so than the tiny fans in the others above.
I had a similar experience with oil filled electric rads too, without forced convection it seemed to take forever to get the room to temperature and the added feature where there always felt a chill in the air if there was a draft.
From what I've played with, I could imagine the Dyson hot will be pretty effective, but for a tiny proportion of the cost the DeLonghi retro fan is a winner.
There are also on QVC like channels electric rads with aluminum cores, where they advertise that it maintains the temperature even when turned off, while 'nice' that suggests it wastes an awful amount of time to heat up the core before putting any useful work into the room. These things are hundreds of pounds too, I suppose there is one born every minute though.
I also had some of those internal halogen ones too, unless your sitting in front of the IR waves you don't get the benefit, if you are then you're probably burning. For outside a pub they are fine, as an internal space heater they are rubbish.