In terms of yardage there isn't much difference between the CB and the AP2's.  You might get a bit more distance with the AP2's.  The main difference though is that you get more forgiveness with the AP2's.  What this means is that if you don't quite connect with the ball the shot will turn out worse with the CB's then the AP2'S .  CB's though are definitely easier to control in the air and if you can connect with them the contact the club head makes with the ball is really nice. 

I went from the AP2s to a combo set of CB/MB.  I like the more compact head of the CB compared to the AP2, and the feel at impact is better, in my opinion.  I much prefer the look at address, and find it a lot easier to move the ball left to right with the CB, with no noticeable loss of distance since switching, except maybe on the worst mishits.  The AP2 is a fine iron, but I felt the feedback was more muted, and prefer the CB/MB overall.

You should -definitely- look into the CB/MB combo.  It is the best of both worlds, for sure.  The lofts match up perfectly, and the feel is almost identical from shot to shot. 

I am looking forward to hitting the new tungsten-assisted CBs myself. 

You should -definitely- look into the CB/MB combo.  It is the best of both worlds, for sure.  The lofts match up perfectly, and the feel is almost identical from shot to shot. 

I am looking forward to hitting the new tungsten-assisted CBs myself. 

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This is the exact set in the 716's I'm going to get fit for on Saturday. I recently about a month and half ago got the 714 AP2's. I switched from the VR Pro Blades and while I love the feel of the AP2's I'm not crazy about the feedback or lack of from my experiences. I actually just started a thread kind of about the same thing as well. On the blades if I don't catch pure I knew exactly where on the face I caught it and I prefer that. The AP2's just about everything feels solid except for thin shots which you'll feel on any club. 

I went from AP2's 710 to my current sticks CB 712's. I liked the look and feel better and according to Flightscope they had slightly less spin and slightly longer, probably because of less spin, for my swing. You know when you don't hit the CB's on the sweet spot, but when you do, its very nice feeling.

My handicap has dropped a little each year and is currently a 1.7 index. I do find the 4 iron not very for giving. Last year I put a 712u 4 iron which worked well. 

I am fairly sure I will end up the new CB716's I think that Tungsten in the longer irons should be perfect for me. Having said that I will test the AP's and look at all the data. 

I haven't hit the 714's in either model. Mainly until this year the CB's have had minimal improvements, mainly cosmetic.

I feel that the CBs are almost the same as the MBs, just with a touch of perimeter weighting due to the cavity back. 

Distance will vary depending on your swing, shaft selection, etc, but there shouldn't be too much difference between the two. The AP2 lofts are marginally stronger, but again your results may vary. There is no question the AP2s are more forgiving, but depending on your ball striking you may prefer the CB. Guys on tour play both, so my $.02 is to opt for the more forgiving option because I don't play for a living and I can still work the ball plenty with an AP2. But to each their own.