on my first one, i got 5 medigels, a shotgun rail amp, some incendiary rounds, a character card, and the N7 talon. on my second one, i got 5 clips, an SMG rail amp, two character cards, and a claymore upgrade.
i really don't notice a difference from a regular spectre pack, aside from the price.
After opening 30+ Spectre packs and seeing nothing but Character Training, I decided to save my Creds in hopes they would release a Premium Spectre Pack today - and thank the heavens, they did. I was pleased to see three ultra rares (two Saber upgrades and a Javelin).
Is it worth it? Hell to the yes. Consider the fact that you only usually get one Gold from a normal Spectre pack, and this one GUARANTEES two, and has a MUCH higher chance for an Ultra rare.
Too expensive? I don't even see the logic in that.