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If you just got the EXOS then I see no reason not to use the included solution. You already have it and it works. If you are refilling the system then I say it's up to you.
I obviously used the included solution when I got my EXOS. When the system needs to be flushed and refilled I'll probably just use distilled water and water wetter or something similar. Then again, I'll probably mess around with modding the EXOS later on also. I really like the setup being external in the casing and will probably try to keep it that way.