Well I don't know how to change them for a start, so the ones that have gone out are still out
!!
They are ok. I have no problem with them in the kitchen area, its bright and they do the job, but I find them too much in the other areas, so I put lamps on instead - but they are not quite bright enough!!
If I was starting from scratch, I would be looking for a mix of lights, maybe some spots around the cooking/prep area, pendants over eating area and wall lights perhaps else where. I do like lamps as well for cosy areas if you are just watching tv rather than doing a task!