The current Android 11 operating system takes up 14 of the 128 GB of ROM in the phone. After getting the phone set up and downloading the same 120 apps that I have on my 64 GB Umidigi F1 Play, I had 99 GB free, a lot of space so maybe I will not bother with an SD card, for now at least. 4 GB of RAM is definitely enough for me and the processor is decently fast with only a little stutter here and there when scrolling down web pages or switching between apps. I found the display is bright and easy to read at 40% or so in all but bright sunlight, when I needed to turn the brightness to the maximum to see what was on the screen. Battery life is incredible. I am not a heavy user. I typically make several calls and spend four or so hours browsing the web and watching YouTube videos on my phone. I got nearly 3 days of this usage from a full charge.
The LTE signal on Mint Mobile was good, comparable to the reception on my iPhone. No 5G, but I knew that this phone was LTE so that is not a disappointment. Wifi seems reliable.
Other reviews might be better regarding the camera since I tend to take only outdoor and food pictures. Outdoor daytime shots were nice, as expected. But just about any smartphone will deliver pretty good daytime shots. Inside and in dim light, the exposure gets cranked up quite a bit (see the cotton swabs and Halloween mug shots). Close up shots (like the battery and USB-C adapter) came out well but it took a few efforts at focusing before a picture could be taken.
For my usage pattern, this phone works really well and I am really glad to have purchased it. My only regret is not getting the 8 GB RAM model since I might be able to use the extra RAM down the line.