I have Deuter Guide 45+, but probably some older model, because it differs from the one on your link.
Nice that it has a zipper on the side, so you can access the content of the backpack without opening it. It has a small sea of straps, on which you hook crampons, skis, on multi-day trips also boots, on the waistbelt space for systems... Additional ten liters at the bottom can be separated into a special compartment where you can put small things, plus it has two pockets in the lid.
Minus is mainly weight - all those add-ons and robustness in the end add something, but nothing bad. Maybe mention price too, but when I think about what nonsense I've thrown money away on, I swallow that too.
And then the nitpicking category, so little things that could be but really aren't essential: backpack lid not removable, would welcome some small pocket on the waistbelt, e.g. for camera or compass.
Regarding back system, ventilation, rigidity, buckles no remarks, never noticed any peculiarities, which probably means everything is fine.
On multi-day walks it has always proven big enough so far, I carry tent, sleeping bag, mat, food, clothes and gear with me.
I think backpacks from reputable companies (and this price range!) are so refined that whatever you take will probably be fine, unless you have specific requirements or preferences for back systems and such.
For day trips of course you can get by much cheaper and lighter.