Do you have a specific redemption in mind and do you have additional Marriott points to add in the event the price is greater than 50K? And are you prepared to use the FNC's within a year? Can you book in advance to lock in your redemption pending the award of the SUB? Also take into account that the SUB may take time to be deposited. I do think it is a 'good' offer but you have to be realistic about what you may get out of it.
If you can get a $300 a night room times 5 nights for a $95 fee, that's a decent return.
If you are going to be speculating and hoping for something good after applying, Marriott will find a way to disappoint you.
Meanwhile, last September I used 320K points to book an ocean view at the Westin on Maui, for son and dil's honeymoon and they got upgraded to Hokupa'a - a $1300ish a night room at the time with lanai/food access. I'm platinum with Marriott. That redemption is in the ballpark of a 50K plus 15K points(with March's upcoming new rules. Just saying there is still stuff out there but you have to shop carefully and strategize. No guarantees there will be anything you specifically would find attractive.
I still have a small boatload of Marriott points. Still getting some value. But then, value is in the eye of the beholder.