I just got a great deal on Komplete 10. Is there any reason at all to have Sample Tank also ? (as you can see - I'm on another equipment buying binge).
FWIW-I have Kontakt and FM8. I evaluated the full version of ST3 and decided it was not worth it, even during that big give away. I did get the free version so I could load my old ST2.5 stuff into it but I was not impressed with the sounds that came with it. YMMV.