I went to Lima for the weekend, on the first flight SCL-Lim, there were 12 business seats available at the time of check in (26 people on the list, no bidders appear), T-12 all the seats disappeared and there was no availability, I asked SS if they knew how many bidders obtained the upgrades, they told me that they do not handle the information because it is an external company that handles it, but I had bad luck this time (was 1 on the list). T-3 I received an email with the confirmed upgrade.

On the way back LIM-SCL there were 7 PE seats available, T-12 there were 3 seats available, I was the first on the list and I got the T-3 upgrade.

In my opinion, on short routes where the bid is lower, the chances of upgrades has decreased considerably, On longer routes being Black Signature is still worth it if there are not many bidders.

al least for me is not worth being BS and i prefer to spend my money in other airlines or just bidding each time