A first quick intro to Haiku OS - Desktop screen shot below

Pros :

Has persistent storage on USB by default, which is amazing

Programs open pretty fast

Installing packages is pretty fast

More software than expected is available to install, for example LibreOffice, Krita, Gimp

Some software packages have recently been updated

Choice between more than three web browsers, the default WebPositive,Otter browser and Gnome Web (Epiphany)

Cons :

By default it is one user system and is allowed to do anything

Created links on the desktop needed to be created again after upgrading from Beta3 to Beta4-nightly

Not sure if and how application windows on the desktop can be minimized

A lot of default keyboard shortcuts are different from another OS like Linux

Notes :

There is Haiku OS for ARM but very much in development, they encourage contributions and testing.

Could be nice to try Haiku OS on Raspberry Pi.

This blog post was written with Bluefish html editor on Haiku OS running on USB stick.