You do not get a refund of the upsize fee if you cancel. If you upsize again from your original size with cancellation you pay again. With eplus you do not.
You will lose 60 days on the life of the deposit because you will have one year from when you cancelled vs one year from your check in date (with eplus).
I don’t know if you lose any trading power or if it becomes more like the trading power your original deposit would have had if it were deposited 60 days prior to check in vs the several months you probably used.