Chausies can be very similar to Savannahs, except of course in looks! They will get along with your Savannah just as well though
With all the hybrid-derived cat breeds (Bengals, Savannah, Chausies), they retain some of the energy and interaction but they lose some of the intensity and persistence of the early generations as Witchy mentioned. Doesn't mean that they are not active and don't get into mischief! I would say that my F5s are more likely to get up to ridiculous heights and in that kind of trouble than my F1s... one of my F1s is a terrible chewer of certain objects while I have not had that issue with any of my later generations. I find the later generations easier pets, but I do think that you need to be much more selective of the breeder/program as it takes much more work to select the right cats to have something special at F5 than it does at F2 level...