I recently did an inventory of the Nikon Z-series for a mirrorless camera, and I am very impressed with the Nikon ecosystem as a whole: the hardware, the software, user manuals, accessibility of the web sites, the web shops.
The logic and ease of use of the camera user interfaces, including the menus, is unprecedented and consistent among all their models, even going back to my Nikon 1 V2 and the film cameras F5 and F6 I have.
Nikon has two types of user manuals, the 'User's Manual' which is a relatively compact quick start, and a 'Reference Manual' which is a complete and detailed description of all the features. These manuals are an excellent introduction to the camera when you want to check for skeletons in the cupboard. The manuals are regularly updated with supplements or replaced by a new version depending on the camera and lens firmware updates.
Nikon has also an extensive range of high quality software, free downloadable from their web site without any hassle: NX Studio (comparable to Pentax DCU), Nikon Picture Control for editing and organizing Custom Controls, Nikon Transfer for transfer pictures to your computer, Nikon Wireless Transmitter Utility for transferring photos via WiFi, and a bunch of apps for your phone (Android, iPhone). All the software is top quality and regularly updated.
A subtle but striking habit of Nikon is to avoid feature creep on their camera's [1]. Only the features who are useful and necessary are present, but not more. They avoid an impenetrable forest of functions that makes so many camera's unpleasant to use (Pentax K3-III, Olympus EM1X). So this is a professional habit and a sign of a well organized development department that is able look beyond the details. What also helps is the well organized and straightforward menu structure in the camera's to find your way without the necessity to use all kinds of buttons with double functions.
All the Nikon web sites worldwide have a simple structure where you can go straight to the info you search, with each camera or lens having their own page with a general part and with technical specifications. This looks simple to implement, but is is amazing how some other brands produce a convoluted mess. This shows Nikon is a downright professional brand which is able to organize their stuff in a consistent and logical way among everything they do, no matter if it is a camera, the software or a web site.
These are a number of aspects that arise when you get acquainted with Nikon as a new customer, and I experienced it as a relief, being accustomed to Pentax.
If you want more info I can recommend the excellent web site from Thom Hogan, with reviews of all the Nikon Z camera's and lenses (and more), with also comparisons of features between the models, which makes it easier to choose. [2]. Another good source with more informal info is the 'Nikon Cafe' forum [3].
[1]
https://en.wikipedia.org/wiki/Feature_creep
[2] Thom Hogan | Z-System user
https://www.zsystemuser.com/
[3]
Nikon Cafe