I have the Dyson Airwrap, Corrale straightener, and the dryer. For reference, my hair is extremely coarse and thick, naturally wavy and frizzy, color-treated, and I like to style it sleek and smooth most days. I would say I have fairly "difficult" hair that requires the right set of tools and products to look the way I want it to. Prior to the Dyson I was using a GHD Air dryer and GHD Platinum flat iron.
Of the 3 Dyson items, IMHO the Airwrap is the most versatile and the most bang for your buck. It gets my hair dry fast with minimal frizz. There IS a definite learning curve with it, even if you're someone who is very adept with styling tools. I would say it took me several uses and some YouTube videos to feel like I was really getting good results.
If I'm drying straight, I do still have to flat iron to "lock in" my style, but I would need to do that regardless of drying method. I rarely use the Airwrap to curl, mostly to round brush dry. It eliminates having to use one arm for a dryer and one for a brush, which is really nice. I will say that the curling option on the Airwrap does the job, but is not my favorite for my hair. I have mid-neck length hair, and when I curl, I prefer straight ends so it looks a little undone/messy. The Airwrap produces very barrel-y curls, with curled ends, if that makes sense. If you want straighter/piecey ends, you will need to flatiron them after. My hair holds curl like nobody's business, so I do not have issues with curl falling out or not holding. If I'm *really* in a hurry I'll use the flat brush option and then just flat iron after. I typically use the dryer or Airwrap on the lowest heat and air settings. Occasionally I use the middle air setting if I'm running late (lol). I've never had to use the hottest setting or the highest air setting on either tool. It's definitely WAY less hot than other dryers I have used in the past (especially T3).
IMHO the Dyson tools are worth the splurge. For my hair, they get the job done quicker, quieter, and with less frizz than other products I have used in the past. I will also say that the Dyson dryer with diffuser is the *only* one I've ever used that gets my hair dried naturally wavy/curly with no frizz.