Nah they're all simple. The basic specs I listed are just that, the devices themselves are completely straightforward, almost too much so. Literally just a single button to wake it up and flip between screens that show input/output values and remaining charge. Power stations will also have buttons to turn on/off AC and DC outputs separately.

The thing you pay more for is charge capacity in Ahr (they like to list mAhr as it has extra 000) and input/output power in W.