I own timeshare. All bought re-sale.
Marriot is out of my class, I'm afraid.
The only question to sort out is, what to do if you want to get rid of it.
Maintenance is for ever.
A lot of timeshare is almost worthless, if you want to sell it. Some people give up paying the maintenance hoping that the resort will confiscate the week back! Some people in America give their timeshare away to a charitable organisation, for free, because they can't get shut of it.
Some folk claim that it costs 50% of the origional price of timeshare to sell it in the first place. This means that overnight it could drop 50% in value.
When you see the value of property in Ireland, timeshare is going the other way,
Look up some of the re-sale agencies and see what the re-sale price of your Marriot resort is.
Proceed very slowly,
Regards,
Liamog