That would be the 'Chronicle' set, right?
I have that one without the box and booklet - LPs in plain white card sleeves marked up by hand and sold to me in a sale by the late lamented 'Mole Jazz' many moons ago.
I would say that the sound quality is comparable to OJCs of that vintage. They are not thick vinyl but are thin pressings like the OJCs. Sound is very acceptable.
From my experience the Prestige 1st and 2nd pressings on Bergenfield and 50th St NYC sound better though - more 'presence' and 'body'. The challenge though will be to find these at lowish cost and in good condition (indeed a challenge these days in the UK ).
Another option would be to pick up the 24000 series Fantasy twofers of Miles Prestige work - 'Miles Davis', 'Collectors Items', 'Working & Steamin' etc. Again, these are very acceptable sound-wise and can be picked up for not many £. I have a few of these and am more than happy with them.
There's also the limited audiophile box of the Miles Quintet material put out by Analogue Productions. Not cheap and long out of print - but has been praised highly both on this board and the old BN board (I've never heard this one). Incidentally, if you check out their site it shows that they currently have some 45rpm releases of the Quintet material for sale ( ).