This is very/most interesting thread, that I'd like to read through later, to hear why others using it, for now just my why (my half euro).
Don't use it because of politics, or alike. Or because it's free/gratis.
I'd buy if it was commercial product.
I'm been using windows and linux/ubuntu for years on and off. When I got bored of one i switched to another and vice-versa.
I started using ubuntu/linux because I have experience with computers/installing/programming, so I was curious about exploring different worlds.
Recently, I completely switched to ubuntu/linux, the reason is because I found out that windows somehow always manages to gives me stress. For me linux is anti-stress. It's simple as that. I feel comfortable.
I've heard/knew of puppy before, and I remember several years ago, trying it out, and thought it is very interesting and impressive.
Then I have small old laptop (or notebook if it' called), think about 9-10 '' screen size(as tablet), because I got fed up with using big screens and wanted tablet-like-computer, that I than ran smoothly puppy on. I got impressed right away, it's exactly what suits me.
I woudl use it on notebook, if the problem isn't that cumputer gets extremely warm and i can see it's 60-70 degrees. All this browsing with desktop view doesn't suits me anymore. I use web browser on desktop/laptop and reducing it to phone-like view, and also using agent-switcher so the pages shows as if it was tablet/phone, I like these from-top-to-bottom, one-row view , it's so easier to read.
So I manged finally to install puppy on a usb flash drive to use it on desktop, because my desktop is full of systems(windows, ubuntu, kubuntu) there wasn't place for puppy. So I'm gradually switching from ubuntu world to puppy because(bionicpup32):
The best (default) theme and menus, I've ever experienced.
Smooth overall operation, that gives light breeze. For instance, ubuntu can feel heavy in use somehow.
The most infinite choice of configuration settings (I've never seen anything like it). The vast amount of different useful tools installed right of the box. Exploring friendly. Interesting to learn. Etc, etc...
The best looking and friendly operating file manager.
Next phase, bootable usb flash drive for laptop.
[So I've got my systems, puppy on computers/laptops etc., androids on phones and tablets (I'm fan of huawei)]
So I think, the main reason I'm using puppy is this freedom of choices.
For instance, I can use windows, but I'm allergic to mac, ipad, iphone and alike. I think it's because of it's closeness, everything is shot-down.
There's no room for explore anything, so it doesn't at all suits my character. (I've seen movie about apple but i don't agree that windows is soul-less compering to mac. With apple i don't feel anything. I use it only on work because I have to).
Windows has a soul - it's mainstream.
At the end, I'm using puppy/linux because:
I'm free from the mainstream, because I'm not mainstream.