I've been using the Philips PM 3215 since I got it from the disposal pile in university, which has been pretty nice for my personal use in things like analyzing mostly signals from transformers and checking output noise of things like DC/DC circuits, but the use of digital oscilloscopes that I used in school labs made me long for one to analyze finer signals like triggered signals that it'll hold, digital signals (such as a I2S/DSM for another project), and the ability to get precise Vpp and frequency readings. After spending too long deciding on an expensive unit or a cheapo one, I settled for the cheap (since I'm still paying off my loans), and I have to say I'm impressed by even a cheap digital oscilloscope.
The DSO138mini is a newer variant of the DSO138 which seems to have started selling in 2020, quite recent! It's based on the STM32 mcu and the unit was easy enough to assemble. It lacks a second channel and multiple cursors but when I compare it to my philips unit, they really don't hold a candle.
[This is an ongoing project and will be updated as progress is made]