I think its only right we should thank companies when we are pleased with their product. All to often, they only hear from people when things go wrong.
I emailed our vets to thank them for their help particularly with the goat worming and testing. The young vet who deals with farm animals is really nice to deal with, has a keen interest in farm animals - including goats, which was not the case at my previous vets - and she goes out of her way to help, and quite happy to answer questions over the phone.
I got a lovely email from the vet concerned, to say how touched she was to receive a thank you. It made me think, when she said it had made her day to get the email, and realise her hard work was appreciated!!!