I bought komplete 14 ultimate and in the past few months I spent about $500 in NI software that is included in komplete 15. There's not much I'm interested in regards to instruments and expansions, since I got almost everything I really wanted that was released unless I upgrade to the collectors. I sent an email asking for a voucher, so maybe it would be worth it, but I received a negative answer. The only thing I really want is the new Kontakt upgrade with the new features. You who have experience in previous upgrades, how much do you think it would cost for the upgrade from kontakt 7 to kontakt 8 ?