I'm not sure there is much in the difference between the Samsung and Crucial ones. The Crucial one fluctuates around the £300 mark on Amazon which is cheaper than the €530 for the Samsung.
I've had mine installed for about a week and it's going great. I had to downgrade my EFI firmware to 1.6, but since I did that everything is working fine. I'm not getting full SATA 3 speeds on it, but I don't think there's anything I can do about that until Apple release a new EFI firmware that works (doubtful). It's still a lot faster than my old HDD.