LMD I would urge you to attempt making an exchange with your supplemental week to see if it is indeed the same as your usual regular week. I get a supplemental week with a Wk 52 I own when there is a Wk 53 in the year, and while it is almost as good as the Wk 52 it does not pull everything.
But I have a real problem with a different supplemental week I got last year - due to a snafu on the resort end, they rejected my II deposit, and by the time I got the stupid postcard from II saying my deposit had been canceled, it put me into restricted deposit timing. I got the situation straightened out with my resort which for some reason showed my MF as past due when they had been paid. By the time I provided them with copies of my canceled check and they got it all figured out, my real unit was apparently gone and they then deposited a supplemental unit into II for me. I never assumed there would be a problem with it, and so never bothered to check out what the unit would do for me. However, after almost a year I was ready to make an ongoing request with it, I discovered that this supplemental unit is restricted to looking only 30 days in advance! If I had caught this right away I would have raised hell because the error was all on the part of my resort, but since I let it sit as it was for so long nobody is willing to do anything about it. Sorry for being so long-winded, but this is all to say - check out what the unit will do for you lol.