Ive had Bluefin now for 2 weeks in mine and I'm impressed, less turbo lag, more torque and better fuel economy. I guess its just down to you seeing the cost as worth it or not. I done a lot of reading as I'm very picky about what goes on my car. I would say 99% of reviews I did read are positive and of course the odd person that had problems. with a large customer base you will always have the odd hiccup, its how they deal with it that counts.
If you think the cost justifies the gains then go for it