Just found a perfect thread for me and decided to join now.
We filed our application in late February, which seems slightly earlier than most of the folks posting on this thread, so hopefuly my timeline below can be of some reference to those waiting or intending to apply through Buffalo.
Med done 21/Jan/10
Appliation filed at CPC-M 21/Feb/10
Noticed a few mistakes in the application
, called CPC-M who said 'wait' 28/Feb/10
Emailed CPC-M the revised documents anyway, no answer 14/Mar/10
Sponsor approved, forwarded to Buffalo 17/Mar/10
Emailed Buffalo re the revisions we wanted to submit (someone never gives up) who repled 'wait until we contact you' 24/Mar/10
e-Cas appears: "In Process/Med Received" 15/Apr/10
AOR letter from Buffalo, given a file number 20/Apr/10
Posted Buffalo the above revisions and asked them to incorporate them with our appliation, delivered to them 11/May/10
Intv wavered, additional document (Statutory Declaration of Common Law Union) request 20/May/10
Emailed Buffalo to let them know the said document was already included in the original application, attached a scanned copy just in case 27/May/10
So far, all the communications initiated by Mississauga or Buffalo came in through post and it took around 5-6 days to reach us here in Western Canada.
I actually didn't choose Buffalo as my processing office, but CPC-M somehow decided to forward our case to Bufflao (based on the fact that I've been living in Canada over 1 year, I guess).
For a non-US applicant at Buffalo and applying as common law with quite a big age difference between us, it has been so far going well. Hopefully we won't receive any more requests and the next thing will be what we are really waiting for...
Good luck to everyone and I'll keep you informed of any developments.