The unlock worked as advertised, and response to questions was prompt and helpful. Would have given 4.5 stars, minus half a star for somewhat vague instructions on the site and the panic of bricking my phone, BUT quick response to email and total resolution in under 30 minutes brings it back to 5 stars.
I went through half of my allotted attempts to unlock without success. The reason is that there were five separate codes supplied and none of them worked with method one. After a quick email, I received more specific instructions about which code to use. Method two worked perfectly first try!