My wife in her ortho practice started using the iTero scanner than Invisalign pushes. She liked it, but I heard her regularly complaing about how "slow" it was to get a full mouth scan (probably 3 to 5 minutes depending on how cooperative the patient was/wasn't).
Then about a year ago, I had to prep a crown for her, and when my assistant had her post prep scan with my Trios scanner done in about 30 seconds (granted it wasn't a full mouth at that point) my wife was amazed at the speed of my Trios, and asked my assistant how quickly she could do a scan of her (my wife's) full mouth. When my assistant had that done in about a minute, my wife started the process to get rid of her iTero and get a Trios in her office. She's been very happy with that decision!
From a scanner standpoint, the iTero's that the invisalign folks are corporately tied too, will get a quality scan, no doubt about it, however there are other, much quicker, arguably "better" scanners out there.
Getting a digital scanner about 5 years ago now, in my mind has been right up there with switching to digital radiography, a little over 10 years ago now in my practice, as 2 things that without a doubt in my mind have been in the top 2 or 3 things where technology has helped me and how I practice dentistry. I would say that switching from air driven to electric handpieces is probably the 3rd of the 3 biggest advancements to me in the 25+ years I have been in private practice now