Yes we have them and some are quite good. We have the shed ones for inside at night (as we have limited electricity supply just now) but they would be powerful enough to light up a doorway at night.
The other ones are the brighter types on poles which are just bright enough to light up the edge of a path.
Homebase sell quite a good assortment and they last a good while - just put in stronger rechargeable batteries than the ones that come with them. The yellowy lights are not as good and do not last so long.
The PIR ones are excellent. Worth spending a bit more on IMO.
Oh firststeps! I don't know what PIR stands for but it is the sort of light that switches itself on if there is movement detected. People put them outside their garages or at their front doors. The batteries that come with some of the solar lights are a bit naffola so I get decent rechargable ones from tesco.