Prior to listening to Harbeth speakers, I have also read that they are warm and laidback. After listening to the the SHL-5, I have to say these are extremely musical speakers that sound very neutral and coherent. There is something really special about the proprietary Radial driver built in-house in the Harbeth factory that largely contributes to the fresh and natural sound of the Harbeth apart from the low-coloration "lossy" cabinet with removable front and back panels. I have owned warmer speakers which include lower range of Sonus Faber speakers, B&W Nautilus 805 and PMC LB1 Sigs(which I still own). I have also listened to the Harbeth Compact 7ES-3 and M30. The C7ES-3 sounded quite similar with the SHL-5 but with less scale and weight, and the M30 was slightly shut-in and warmer but with better refinement.
I heard from the dealer that a few folks who owned speakers that cost 2 to 3 times more than the SHL-5 had dumped them for the Harbeth after listening to the speakers. There are a lot of nice beautiful speakers out there that have razor-sharp detail, better refinement and imaging but few would match the sheer musicality and coherence the SHL-5 possesses in its price range. I believe the SHL-5 would be my final pair of speakers after searching for more than a decade.