Personally, I think that GMs should really provide these at weddings...it's sad at the part of the wedding when rings are supposed to be traded, and there's no direct indication of it...this would symbolize that perfectly...
This is by far my favorite firework. I am always willing to spend ridiculous amounts of money on these... I wish there were a moogle selling them more often, though. I realize they're just horrible to have to spend money on to make (light crystals! >.>) but they're so worth it, and they make so many people smile. <3