Best games now are 25c 3/5 play 9/5 JoB (98.45%).

I was in KC at the end of June and I found four 9/6 JoB machines in the high limit area at Harrahs. 9/6 was only available at a $5 denomination. They require 3000 points to earn Diamond In A Day, which is $30k in playthrough on VP. The high demon required was disappointing, but this is the cheapest way I found to earn Diamond at Harrahs NKC.

Player's club is now cashback OR Comps.

Slot club operates on a "Don't ask, don't tell" basis. The amount of coin-in required to earn
bonus reward credits varies, depending on machine played and whether you win or lose.
Harrah's FAQ

1$ 9/6 ddb and pseudo NSUD on all machines at the Twist Bar.

As of 11 January all full pay machines had been removed including high-limit machines.

All PE machines at Harrahs now pay zero Bonus RC's. The (6) upright GMakers are still OOS.

All of the AA are MIA. Removed.

The six Bally GameMakers that were along the escalator on the upper level have been put back out on the floor. They are now in the Video Poker Zone. Here's the weird thing: ALL the short pay games that were very popular (Triple Trouble, Keno, Deuces Wild, DB 9/6, JOB 8/5) have been removed and the only games left on the menu are Pick'em and All American! Nearly all the dollar AA machines are gone. The row of six "old, green" machines along the wall have been replaced with Game Kings that have Pick-A-Pair on them. (Pick-A-Pair is what IGT calls Pick'em). Furthermore, the two dollar GameMakers that were near the high-limit area on the first floor are also gone. Here's the weirdest news of all. The high-limit Area used to have 5 Game Kings with various $5 progressives on them. Three of those are gone. They've been replaced with new Bally GameMakers with...drum roll, please...$5 All American. Yes, with the 100.72% pay scale. Be still, my beating heart. So here's the final AA tally for Harrah's KC: (15) .25 machines - (3) $1 machines - (3) $5 - location and game details are unknown. Two of the new Gamemaker machines in the high-limit room are $1.00/$2.00 multidenom and one of the machines is $5.00 only. These three machines have AA, Pick 'Em, and 9/6 Jacks.

to 4000) Base Reward Credits in the year to get Platinum status and 10,000 to get Diamond status.

to 4000) Base Reward Credits in the year to get Platinum status and 10,000 to get Diamond status. Comps don't expire for 6 months, and are banked indefinitely as long as one point is earned every 6 months. Also, comp points can be used at any Harrah's property. Most Marketing offers aren't deducted from your Reward Credit balance. Hosts can over-ride the new Rewards Program to take care of "good" players. Hosts can't give discretionary comps until all reward credits are used up.

It looks like the reduction of AA inventory at Harrah's KC is permanent. The line of seven quarter GMs (as well as the dollar slots) on the upper level next to the escalator have all been replaced with new slot machines that are very pretty to look at. There are still plenty of AA machines at this casino, but I guess this is a sign of what's coming.

There are (5) $5  9/6 JoB progressives in high-limit area.

They have moved the lower level $ AA machines, or I should say they are gone. A couple weeks ago the old green $ MG machines were dark. I just knew they were on the way out but to my surprise they were back in action on the last visit. Those machines have AA, 9/6 JoB, and Pick'Em. There are 6 large screen upright machines -- 3 in quarter and 3 in $ -- still active. They are back to back with .25 on one side and $ on the other. These machines also have AA, JoB, and Pick'Em. There are a few old AAs in 25 cent in the middle of the "Poker Zone".

The two dollar MG w/AA on the lower level have been turned back on, but still use coins (no TITO conversion). Furthermore, the six dollar MG w/AA on the upper level have now been turned off. So there are now only two working dollar AA machines in all of Kansas City.