I just looked into the issue myself, after having upgraded to 10.11 and seeing that my (previously free) version 2.2 of TRIM-enabler no longer works with 10.11 Then I came across this page about enabling Trimforce which is built into 10.11 and without any extra costs!
The question is: does the (free) "Trimforce" command built into OSX 10.11 do the same thing as the (purchaseable) TRIM-enabler software, or is it worth laying out the cash for the latter? Is it really just a graphical user interface for the Trimforce command?
I've got two Samsung 830 SSDs in my Mac Pro along with several hard-drives (which I assume will just ignore TRIM anyway). PS: I read this page on how to enable TRIM on third party SSDs in OSX which links to an SSD blacklist page saying that those SSDs probably shouldn't have TRIM enabled as they don't support TRIM properly. Among the geeky programming code it seems like my drives are there as they list "Samsung SSD 8*". Does anyone know any more about this?
I doubt you would ever notice "extreme speeds", just from enabling trim.
And, you won't see a sudden, noticeable slowdown, after you disable trim. Keep in mind that trim is just a housekeeping task, and not the only one that SSDs use. One result of housekeeping tasks can be preventing long-term performance degradation. There's nothing that will happen with trim that will make a noticeable change for you, except for the first boot or two after enabling for the first time, and you have been using the SSD for several months (or years) without trim.
And, some SSDs don't particularly need trim, when other routines on the SSD do a similar function - which would likely be why those few SSD models that macstatic found, don't really require trim enabled.
The simple answer:
If you are concerned about using trim with your SSD, and you think it might be one of those that are blacklisted by that Linux support page, then don't enable trim. Ignore trim, as it is not particularly important to most uses, anyway.
(many SSDs already do something trim-like natively)
Or, think of trim as important, and just use it regardless of other's opinions.
That's the problem: opinions, and lots of them (no offense intended).
What are the FACTS about needing TRIM or not? Is there a definitive yes/no answer or does it depend on the specific SSD model and OS type/OS version?
I'm just a regular Mac user who wants to ensure that my SSDs will last as long as possible, work at their best and be done with it.
It's the link in post #8 - again, that page.
or, here (that's the specific link to the list of SSDs. Good luck in determining which specific SSD models that list is referring to. Looks to be nearly five years old, but I could be wrong on that. That would leave it questionable if it is still relevant to this discussion, but there it is for your perusal ... )