I don't know man.If you have money and like spending it than go for it.But I think it's waste of your money.You have all those keyboards and they are all good.Why not put money into software for your mediastation(komplete 8,omnisphere,quantum leap instrumetns or whatever).
It will give you a lot more instruments than any arranger.And it will be cheaper for you.
But.if you like spending than you might as well go for pa3x,even for t4 whatever the cost.They are all good instruments.