I haven't heard the Sterlings but did buy a pair of Spendors from Jeff Stake about 15 years ago. He was very accommodating for both the listening session and the subsequent purchase. (Looks like he don't carry Spendor anymore.)
Advice on Sterling LS3/6
I learned on a UK Spendor forum that Derek Hughes is retiring and closing down Sterling Broadcast. They are clearing out inventory at excellent prices - mostly LS3/5a V2 and V3, but also a few other models. I'm looking at the LS3/6. The regular price for the LS3/6 is $6000/pair and the sale price is $3300 (plus $600 shipping to the US).
One pair of LS3/6 have been shipped to Jeff Stake, a dealer in Indiana. I told Jeff I may be interested, but I've never heard them. I could drive down to audition them (I live in Chicago) but I thought I'd check on Agon to see if others have experience with them.
I currently have Spendor SP3/5 R2 speakers in a small room. The LS3/6 would go in a new listening room, 17x23 ft. I will be using them with Bacch4Mac and a solid state amp (undecided, but probably Starcrimson monoblocks). Qobuz is the source, over a Bluesound streamer with LPS and English 8 switch. I'll use the Bacch's RME DAC. I like vocals (Melody Gardot), Argentine Tango (Gotan Project), Van Morrison, Duke Ellington. Seldom crank it up.
To my mind, the real alternative is a Harbeth 30.x or C7ES3. At Axpona I heard a Spendor Classic series (not sure which) that I really liked but the cost is beyond my budget (over $10k). Any comments would be welcome.
Latest review of the Stirling LS3/6 is from The Absolute Sound (where the retail price is listed as $9995):