I would say I have moved from a Mac to Librem. I still am partially using both machines. I have an iPhone and my wife has my old Mac.
I have dabbled with Linux for a number of years. For me, it was after the the security holes that came up around 2012-2013. I started to look to move away from Mac around that time.
I saw my first true ability to do so when Dell made the Dell XPS-13 Developer with Ubuntu pre-installed. It worked fine, but it seemed still a bit unsecure.
I have not completely switched away as I still have my iPhone. Once I receive my Librem5, I will then cut all cords to my Apple ways.
I will say, if you are dabbling, understand that now, especially with Librem One, Purism offers about everything you will need to make that move completely.
For me, I will want to use an ultra-secure back-up method, other than locally in my home…i.e., something in the cloud.
I have a Librem 15 and love the device. It is ultra secure and I purchased it with a bunch of upgrades.
If you have not yet purchased a device, I can definitely recommend the devices.