How full can I let a 256GB PCIe SSD get?

Hi all,
How full can an SSD get before it becomes a problem/degrades performance or causes excessive wear (or will Apple's wear leveling take care of the excessive wear potential)?
I'm looking at a 2014 2.6HGz model with 16GB of RAM and the 256GB PCIe SSD (I don't think I want the Fusion Drive), but I suspect it's too new for anyone to answer that question about that specific machine, so I'll ask it in the MBP and/or MBA forum if I don't get an answer here.
Don't know if it would be any different with a 2.5" form factor SSD, but if anyone has any info on that, that would be helpful too.
I've tried googling and haven't found an answer yet, so here I am.
I'd be running 10.10 with FileVault 2 turned on and using TimeMachine via external HDD. I have about 120GB used on my current HDD so that's about what I'd have on the new one. At this point in time, I'm sure that free space is not an issue, but I wonder if it could be as the SSD gets more and more full.
Any help is appreciated!

mjl2013 wrote:
I've had many SSD's, starting out with the Intel X25M-G2 80Gb. Often there are recommendations of 7% over provisioning and I regard that as a minimum.
I've been doing a LOT of reading on this since my OP. It sounds like some manufacturers hide the 7% so it's safely stashed away so users cannot get rid of it, while others don't, but it's a recommendation as you've stated.
Due to the work I was doing I used 20% which leads to a speed increase and to a longer life expectancy. At one stage I had even allocated more but it was overkill. For "normal" usage I would be somewhere between these two extremes.
I like to be safe, so I like the 20% idea.
I've just ordered the 2.8 Ghz model with the 256 SSD, for me it is the model that has the "sweet spot" and I'll be wanting to have at least 15% free space.
Does that leave you room for expansion for the length of time you expect to keep the mini? Or are you using an external drive to store data on?
Wonder if you've looked at my other thread asking about the 2012 quad vs the 2014 dual i5? I think I'm leaning toward the 2014, and was thinking about the 2.6, but then saw that an upgrade to the 3.0 was also an upgrade to an i7, granted for $200 more. And I think I'd like the 512GB SSD and 16GB RAM to make sure for the future (this $699 mini is getting awfully expensive!).
This free space can be unallocated (as in "not partitioned") or a part of a partition that is not filled up completely.
It's getting late and I'm going cross-eyed from reading so much, so perhaps that's the reason, but I'm not following you here. Would you mind explaining a bit more or a different way?

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