When I read the title, my first thought was maybe a MLB reference. Then I remembered this is a paper money forum. If you like it, keep it, but Double Triples is hype term used by sellers on Planet eBay for a note with nothing else going for it.
I agree with you in keeping it unless you absolutely needed $2 for something critical.
I think the 555 888 is cool, I would keep it being a techno geek and the reference to a 555 timer chip makes it something I would defiantly keep.
I have a few bicentennials $2 notes, I think some have sequential serial numbers I forget, but I don't even care what they are worth, they have value in the fact I like them and therefore my appreciation for them gives them incredible value to me.
In other words, you may not give me $10,000,000 but that is about what it would take for me to give these up.