Per the Tug database used from collecting data from owners a platinum 2 BR week gets 3475 points, so not enough to book any full week during the platinum season. That is typical for most of the resorts.
https://docs.google.com/spreadsheet...guovIlHjggivemuPWYpnkSaXg/edit#gid=1983378178
Since you bought pre 2010 it likely will be free to enroll during this promotion. Most pre 2010ers who were remotely interested have already enrolled so it isn't that many. If you usually book at your home week even enrolled you won't be converting but will now owe additional fees to Marriott. Your unit doesn't lock out and you don't use II to exchange your week then it doesn't sound like it would save you anything but it would give you flexibility for the future. On the other hand Marriott hasn't imposed any additional resticitons on enrolling pre 2010 weeks so if you use your week for now, no reason to enroll until you want to actually use the internal exchange for partial weeks.
That spreadsheet shows 3475/4625/5300 for Platinum. What are the differences between the 3 levels? The period we usually go requires 4225 to reserve, so I do need to understand this. And on the sheet, the 2017 fees matches to the penny what I paid at the beginning of 2017, so what additional fees are there?
Thanks