I have used home kits both STI and for another health check a few years ago. I really struggle with the finger prick blood extraction, my blood instantly congeals no matter what I do. The home rapid HIV tests however work directly from the wound, these are excellent and give instant results.
Like Smiths I prefer attending in person for pretty much the same reasons, as well as the blood letting issue. Gives me chance to ask questions, this last time they took anal swabs on the basis some saliva can dribble round from reverse oral. I do tell them what I do, and have been given the Hep B vaccination on that basis. In the meantime I've bought the HPV vaccine privately because it's not available to my age group on the NHS but I fall within the beneficial age range.