You made it sound like Disk Sensei was the answer - it isnt.
Well it is an answer. Yosemite is just more locked down. You still need the app to enable TRIM just that you have to remember not to reset your PRAM unless you disable TRIM again. Apple are just being idiots here for doing this. Third party TRIM should work with all drives recognised as Solid State. In my case the OWC drive was recognised as solid state just that TRIM was not enabled.
What's more common I imagine is for someone to upgrade from a HDD to a SSD - such is the case with the OP.
But that also requires opening up the machine, a process IMO far riskier than editing a setting and remembering to disable Trim if doing PRAM reset. And even then your data is not lost, you have to boot in "safe mode" and put some commands into Terminal.
Anyway - my warning not directed to you but to others. It's a risky procedure (and one that I elected not to pursue when I upgraded to Yosemite).
I understood it's not directed at me. In fact I don't even run Trim Enabler in the background but despite that Trim remains enabled. There is risk in everything, having regular backups which one can do with the free version of Carbon Copy Cloner or Disk Utility is important. I did that before installing my drive.
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