I’ve been gifted two. A 3/8 flex head husky, and a 1/2” HF.
The husky one I like a lot. I keep it in my oil change toolbox. It’s short and flexible most of the time, and if a plug is stuck tight for whatever reason, extending it gives me a lot more torque.
The 1/2 I use for turning over MB diesel engines for valve adjustments and other repairs. For that it’s fine. Don’t really need an extendible for that, but it does the job.
For anything else I have a range of Snap-on 1/4, 3/8, and 1/2 ratchets, and a few other old USA made craftsman.