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I'd say this offer is not really outstanding and it has been around on creditcards.com for at least several months now. It is slightly better than the usual 30/35k offers, but it is not something I'd jump the boat without further thinking it through.
BTW, someone recently posted about getting a personalized mail offer from Delta/Amex for 50k skypesos with even lower spending requirement, so it's not at all exclusive with $5k for 45k.
If it was 70k or even 75k miles offer, I'd personally applied for it the very first minute I saw it
I was fond of my 100k after $3k from the AMEX Plat, but yeah honestly. Not really worth jumping on an offer for 45k sky peso's.
25k for a pack of gum seems worthy. If you up for getting rid of the card after the year then go for it. I try to avoid cards that have no use other than the bonus offer.
Get United Explorer card then - there are links out there for 50k UA miles + 5k miles for an authorized user (add your dog if you have nobody around - Chase seems to be fine with that not asking for SSN for AU) with $1k spending required.
I bet 55k UA miles will potentially get you a better birthday trip than 25k Delta miles...