The CoRe seems proven. Awesome build quality and performance, no complaints from anyone. The CoRe is a slightly better deal, with the Pro Pack you get 3 coils compared to the Racer's 2 at the same price. From what I've read they are so close in performance you probably don't need both. I did get a few minutes with a FORS Gold and it was awesome, but performance aside it was so balanced and easy to swing. I wonder with the Racer's S shaft if it will be as balanced. My ATP with the S shaft swings much heavier. Maybe someone who has swung both could chime in here.
From all reports coming from a few very credible people on this forum the Racer is a very good detector. When they finally get here some quirk may come out but I kinda doubt it, time will tell.