I've had my Forte 4s for 6 months and I love them. The Cornwalls sound a bit 'boxy' to me. But that was 1st version of them. Plus, I didn't have the room. I'm running Moon 340i with the Fortes-so I don't need to crank them. They are pretty happy at 9 oclock. I formerly owned a pair of KG4s and loved them for 30 years. The Fortes are very detailed-a bit bright out of the box, but they settled down within the first week. The bass is really good too. Big enough and smooth. I like the passive radiator idea over ports. Midrange is where these excel. I prize dynamics over everything. The Fortes are very dynamic and very musical. Non analytic. Fun! I compared them to the B&W 702 ( which the Store didn't do them any favors in setup). They sounded blase to me. The Focal Aria 926- of which I thought I could adapt.  I listened to the Revel F228e which sounded precise, but too analytical for me... I really wanted to hear Magnepan 1.7s and the Volti Razz as well, but I'd need a Sub for the Maggies  and  another $1k for the Razz,  so I stuck with what I knew. I simply love the live Klipsch sound over more precise offerings. Everyone has their own tastes in music and sound. If I won powerball-I'd give the 802's a shot...
One thing that I forgot to mention. If you are listening to a well produced piece, these sound unreal! If you are listening to something not so well produced-The Fortes will make you well aware of it....There are some 1960's Blues records that were very well recorded back in the day that make my jaw drop. There are pop records recorded last year that make me cringe. So there is that to factor in...

Heard the Cornwall Iv vs Heresy IV in the showroom. Was blown away. I was auditioning speakers in the $4-8k range vs. my historical $1-2k budget. 
 

I didn't hear the Forte IV's that day, but the store owner would only play high res jazz. I had to depend on online reviews to evaluate the bass characteristics of the heritage line, and in an unprecedented move (for me) ordered the Fortes without hearing them. I was afraid the Heresy's would fall short in the bass department, but they were so similar to the Cornwalls (compared to other lines he carried) I was confident that the Fortes would have the same open live sound they I liked. 
 

indeed, the Fortes liven up my room compared to my Paradigm 800F's that sounded so good in the store but got swallowed by my room characteristics (although they are amazing in their new home, my recording studio). I can't comment on the III's, I've never heard them. 
 

So the Fortes are doing quite well, and provide an experience that is new to me and way better than the $1-2k speakers that preceded them. That being said, since I have had numerous speakers in this room and their respective room correction measurements I can say without a doubt that the Fortes roll off the high end quite aggressively. Not sure how that is possible with horn tweeters, but it is what it is. It's completely opposite the Klipsch Reference Premiere center channel that I bought to go with them. Otherwise, they sound amazing with all types of music and in all listening positions. I'm not sure if the Heresys would have made me happy, but I have a hard time saying that the Cornwalls I heard would be all that much of an improvement 

 I compared them to the B&W 702 ( which the Store didn't do them any favors in setup). They sounded blase to me. 
 

Hmmm. Was that a BB? 702's are a real lively speaker.