We knew these would fit as they are a replacement for an older pair that were still going strong but looking increasingly scratched by brambles. Good enough that the cadet in question wanted the same again.
Some people posted saying they had difficulties with a bt router. We have been fine and the signal is extended/stronger upstairs. We were not expecting miracles but this has performed well in line with expectation. Very easy to set up as well- a 10 second job.