I have used it regularly over the years. Daytime journeys used to be average loadings with rammed peaks (especially. AM) when it was the 18. As the hourly 10 it has been sparsely loaded at all times.
An example I think of how to kill a bus route.
It's always been borderline tendered/commercial - and of course it's had a fair number of incarnations - South Glos 518, First 18, Wessex 501 502, etc.
As sad end. And it leaves a gap through the southern end of Emersons, Gipsy Patch, and with the rerouting of the 77 leaves Parkway-Filton with just an hourly service, and that via Cribbs.
Remember the days not so long ago when Parkway-Filton had each hour 18, 18, 501, 502, 625, 82 and 555?