To me the revpoints seem rather terrible as a perk, Chase I think is now going to do the cashback on their credit card on certain categories which might be better.
The pay in 3 is a great feature for me but I have the max limit.
It depends, I got the max limit a month after the cap was raised but my other half has not had an increased limit in a while now. If you dont need it dont increase the limit, it makes little odds to your rating and can work against you as you have too much credit available if I recall. The magic number and tips on clear score etc will encourage having over 15k but remember they also try to sell you credit cards so its not necessarily the best advice as its in their interest for you to open a card with them.