I've owned this boots for one year and put them to good use and worn them for at least 150 days.

I'm an outdoor professional and have been for 20 years.
I needed a comfortable light weight boot for all sorts of land based activities.
The first real test was a week in Morocco. Very comfortable straight out of the box, super lightweight. Not great durability. The sole lugs started to break and tear in the rocky terrain and trails. This was after only three weeks of ownership.
The ankle support is great, high and still giving good range of movement. Water repellent not 100% waterproof. These are pretty good in very hot conditions I have never had very sweaty or swollen feet from overheating. They are not a "winter" boot I have worn them in snow on a number of occasions at very low level and they grip ok and keep out the cold. I would never take them near hills with hard snow or ice they are far to flexible.
Pros
Comfort and weight
Cons
Durability I expected more longevity from a boot

I've used Magnum and Lows boots in the past but the GSG9 boots are like slippers on my feet. They give good ankle protection and are light to wear. Worn on a 12 hour shift on the landings , they remain comfortable. One year in and plenty of life left in them. Will definitely be replacing with another pair of the same when these eventually wear out.

I have had magnums and bates boots in the past but these boots are defiantly a lot better. They are so cosy too wear defiantly one off the best on the market.
You defiantly get what you pay for !

The most comfortable boot I've ever worn.
Waterproof & warm in winter, cold in summer.
My only gripe is i do a lot of walking and on average do 12hrs x4-5 shifts a week & at just over 13 months old the sole of the boot has worn away to a flat surface. i'm now at around 18 months and the inner structure of the sole is now showing and collecting stones in the small square structures.
The boot for all its tech is worth the price but knowing the sole is not very resistant & only lasts over a year and as far as i'm aware cannot be resoled by Adidas the price should reflect this.
Great shoe just too expensive for over a years use.

I have been using these for a year (almost). For me these are the best boots available on the market. very comfortable.