As long as they lie in order, or alternatively you have a way of verifying the write (e.g. by reading it back) then you should be able to make it work fairly easily.
If they just completely lie - the data is just cached but never actually written - then you're screwed. There's obviously no way to make a persistent storage device out of something that doesn't persist your data.
In my experience it's the latter as far as I can tell. It has actually written like 99.99% of the time, but about 1/10000 writes it actually isn't writing.
exFAT has the lovely feature of potentially not only corrupting the file, but also corrupting the metadata for the surrounding system as well. It's terrible.
As long as they lie in order, or alternatively you have a way of verifying the write (e.g. by reading it back) then you should be able to make it work fairly easily.
If they just completely lie - the data is just cached but never actually written - then you're screwed. There's obviously no way to make a persistent storage device out of something that doesn't persist your data.