I recd my new 718 AP1, AP2 and AP3 irons about two ago and have played multiple rounds with them thus far. My conclusions are the following:
AP1: I love the new look...no more large cavity in back with longer irons plus the sound and feel are much better plus they go a mile!
AP2: The smaller look with more solid feel at contact are just two improvements I am really enjoying with these irons. The forgiveness also seems to be even better than the previous model if this is possible!
AP3: new iron model so no comparisons to previous model however I like the look especially when paired with the AP2 irons. Very forgiving, even more than the AP2 plus the distance is amazing. I really like the sound as well, definitely more firm than the soft AP2's but overall a much better feel than the AP1's if that has historically been an issue to a player.
818 Hybrids I have had about a week and I love the new feel, far more solid feel and sound, plus EASIER to hit off the turf. A more compact looking shape at address gives the player confidence over the ball without a doubt.
Overall, if you have not hit these you should get out immediately and try them! I have already sold my 716 irons since the 718's are a step up. Congrats Titleist! I think you have another win in these irons and hybrids.