So in the interest of full disclosure, I have never had a tumble dryer before so can't compare this to anything else. That being said...
This is GREAT! I was hesitant about buying something this pricy (I know it's not the most expensive out there and is probably considered mid-priced but for us this was a considered purchase) when there were cheaper versions out there. However, the efficiency and practicality of this machine makes it worth it.
Ours is situated under the stairs on a tiled floor in an average sized 3 bed end terrace and it is so quiet! We can barely hear it.
The app is great (I was dubious about the 'point' of it initially) as it can help you pick the best cycle for the items in the machine, it tells you how long is left on the cycle and also rough costs for use.
I have used it several times now, testing all but 1 of the cycles and all have come out dry apart from 1 sheet which was ever so slightly damp in places. I will say this though... it was only on setting 2 (so not the super dry setting) and I had ignored the suggested setting/items mentioned in the app so it was probably my fault. All it needed was a quick blast on the shortest timed cycle and it was perfect.
I love how it assesses how damp the items are and adjusts the cycle lenght accordingly. So, you could select the cotton cycle and it initially says it will take 2.5hrs (for example) and then it adjusts based on how quickly it's drying and the app will let you know it's only got 1.5hrs (for example). This is great for saving money and the environment.
We have the series 5 washing machine and love it so this was always in the running as an option but it was recommended to us by someone and we would recommend it to someone else without any hesitation!