A few years ago I would have said they are useless but I ended up buying one for my off grid cabin in winter and I like it.

I have solar panels and batteries with a small 500w inverter in the cabin and the setup works very well in summer for my usage. However temperature averages in January here are around -10C and the batteries get too cold to charge them. Also there is generally not much sun in winter anyway.

So I bought a small generic power station to bring there and it’s excellent for my needs. It lights up the place and charges my laptop and phone.

To be fair it’s kind of overkill because my laptop and phone can be charged from a hefty power bank using PD.