I am a former BBC engineer, and spent a good three years testing and evaluation loudspeakers in the now defunct BBC Equipment Department in Chiswick. In April 1980, I purchased a pair of Rogers Export Monitors for £250 (BBC staff discount price) which was a lot of money in those days. They were terrific. Not long after that, Rogers allowed me a free upgrade to Studio 1s - the cabinets wrere identical to the Exports, so all I did was to exchange the baffles (with all the drive units and crossover on them) for a pair of Studio 1 bafffles.
Those speakers are still in regular use in my lounge - they are still my main Hi-Fi speakers (I have a pair of Q Acoustic 2010s in my study-they also sound excellent).
I see no reason to change my Studio 1s as I still think they sound amazing. Luckily, my cones haven't sagged! Every now and again, I 'squeak' them with a sweep sinewave from my signal generator. The sine waves still sound OK - any cone formers rubbing against magnets due to surrounds sagging would produce a buzzing sound - ie the sinewaves sounding a bit more like squarewaves! Although they are not directly a BBC design, they were heavily influenced by BBC speaker design philosophy and I would say that they belong to the same genre as the Spendor BC1s, (and a similar Harbeth design). a large number of which were in extensive use in the BBC, particularly in the radio network continuity suites in the 70s and 80s.
Even if I were to buy new speakers for my main listening, I wouldn't get rid of the Studio 1s. There is too much of my past professional life tied up in them ! I only hope that if the drive units start to sag before I do, then I could get replacements. Perhaps I should have invested in spare drive units (when I bought the Studio 1s) and stored them safely just in case !
Howard (Ted) Edwards