My experience with this card: I applied using the link provided in this forum, going for the Signature card and following the advice given here regarding specifying a credit limit of 15K. This was two weeks ago and the next screen showed a "conditional approval", along with the promise of a follow-up email the next day. Said screen also specified which documents were required, both for identification and income purposes.
The email never came so I uploaded documents the following Monday. On Tuesday, the promised email came through with pretty much exactly the same content that the screen following my application showed. The same email arrived the next day before someone called my "payroll department" - speaking to my wife, (it is only her and me) according to my accountant, technically I am not self-employed.
They confirmed employment with my wife, however they wanted to speak to me as well and called a few minutes later. We had a bit of an argument as she insisted on getting a copy of my tax return and I told her a couple of times that surely the copy of my most recent notice of assessment was at least as good. Finally, she accepted that and ended the call by saying she will pass on the application to the decision-making department and that I would hear from them. The next day, I had an email in my inbox, congratulating me for successfully applying for the Signature card so overall, the entire process took eight days. The card arrived yesterday so eleven days after applying, which I think is pretty good and definitely better than expected, after reading a few comments here.
Thanks to everyone for your help, guys, hopefully this might help someone in their applications!