I had an interesting experience with LS60 this week. For context, I own 8351Bs and have used them in a pro studio, 3 semi-treated home studios and my untreated living room. I also have Devore O93s in my home system, and have heard many many pro and hifi speakers in various environments.
Anyway, I'm setting up a new system for the family room, and when I found the LS60s I was very excited. They are very very appealing - they look nice, offer a simple solution to modern music listening, and come with the legacy of KEF. I found a place nearby to listen to them, and went to check them out, fully intending to buy them. The space was lightly treated, but pretty large - a better listening environment than the average living room, but not as good as a dedicated listening room or studio.
Much to my surprise, they didn't sound very good. Well, the highs actually sounded very good, lovely in fact. The mids however, were quite congested. The midrange lacked clarity on modern electronic and pop tracks, making it difficult to separate sounds where compression and EQ were employed heavily, which is a lot of modern stuff. Reverbs and delay tails were pretty difficult to discern at the level I'd expect for the cost. With jazz, both sax and trumpet sounded hard and boxy. This reflected a general trend towards over-emphasized lower mids. This could be attributed to the room, but was consistent as I walked around the space, so it wasn't room modes specifically causing the problem. So some improvement could be had here with room treatment or EQ, but I'd still be concerned about their ability to resolve layered music
The bass range was rather inconsistent. With rock music, some of the texture was there, but overall lacked weight. That said, what bass there was on the rock recordings I listened to was tight and 'tuneful' as we like to say. Switching to various electronic tracks, the bottom end exploded - suddenly I was swamped in bass. It still sounded pretty good in terms of texture and musicality, but the subbass was just too much. Again, I walked around to room to sniff out modes, but the effect remained the same.
To be honest, I assumed that the speakers had been EQd in some weird way, but was assured that was not the case. There was another guy in the room listening along, and my wife later told me he'd been introduced to her as the dealer's KEF rep. So I assume he thought they sounded somewhat as they were supposed to, or he would have stepped in to help make a sale to an interested customer.
Ultimately, I found the LS60 lacking in too many important ways, and will have to continue my search for a simple system for home. And I am pretty confident in saying that these do not even come close to 8351s or any of the Ones family. Not even close.
I do think these present a really great option for people who are looking for better sound and have a relatively large budget, but whose eyes glaze over when we start talking about streamers and preamps and speaker cables. I think we all have friends like that - they ask for recommendations, we do our best to provide simple clear suggestions, but they still get overwhelmed and go back to their $25 bluetooth speaker from Amazon. For them, I think these would be a really wonderful solution - simple, clean, sounds a lot better than what most people have.
edit: clarified my comment about budget above.