I've never used ang Auto Finesse products so can't say either way if they're any good. What I do see on the specialist detailing forums Addicts, Central etc is a general disdain for AF products and accusations of expensive marketing, packaging and that much better products are available at less cost. I'm sure the vast majority of their products are OK but brand snobbery is alive and kicking in the detailing world, some swear by them, others wouldn't touch them. Many part time and pro detailers also wouldn't be seen going in Halfords either and will only buy through their favourite specialist detailing supplies shop, either online or over the counter.
Personally I use products from a wide range of manufacturers/suppliers including Sonax, KKD, Wax Planet, Bilt Hamber, ValetPro, Poor Boys, Autoglym, AutoGlanz, Koch Chemie etc etc. I've not come across anything which doesn't do the job it's meant to.