In the UK, many of these decks were only used on "high days and holidays" and actually had very little use as a result. The downside was that the greases and other lubricants gummed up and the decks stopped working, many being scrapped unfortunately.
Good luck with trying to find a good one. I'd say that the beogram 3000 was potentially the best of the lot as the platter gave better support to the record, with beneficial results to the sound quality. The supplied SP10 or SP12 stylus is a huge benefit over the dull-as-ditchwater SP14 in my opinion. Depending on stylus condition, Axel can rebuild to either "as new" standard, or even better, with fine-line and Shibata tips, which should further improve clarity of sound.
Do please bare in mind that standards of LP reproduction have improved dramatically in the last thirty years or so and by now, the Beograms of this era (even the 4000 series) will sound a bit bland and possibly rumbly depending on condition. I still haven't used my Beogram 3000 in anger, despite having a "new" SP12 to use with it, but I'm not expecting miracles, although years ago, a 3000 I serviced compared well with a Regar Planar, a good little UK made turntable.