Thunderbolt SSD TRIM option

Hi there.
I run iMac 27 (late 2013) with Core i5 CPU and 1 Tb HDD on board.
As you may know internal HDD's performance is not good in comparison with SSD, so I decided to buy external Thunderbolt SSD at apple web store and to instal OS X on it to increase system productivity.
However I read a lot concerning issues with impossibility to activate TRIM option on 3rd party's SSD manufactures. It seems TRIM is vital option for any SSD, and here is the question: shall TRIM be enabled, when running OS X on external Thunderbolt SSD (for example LaCie Rugged Thunderbolt SSD and etc.)
Cheers.

With an SSD from OWC, there's apparently no need for TRIM. In fact, OWC suggests disabling TRIM when using Yosemite.
http://blog.macsales.com/27116-disable-trim-before-upgrading-to-yosemite
http://blog.macsales.com/11051-to-trim-or-not-to-trim-owc-has-the-answer
...but I can't speak for prior Mac systems.

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