I love my one of these, over 20 odd years of almost daily usage. Lugged around various Uni halls and rented accommodation and all without missing a beat.
I bought a CD63 a couple of weeks ago, in fact I’ve bought half a dozen bits of old hifi( and some new stuff) Turntables, Amps, Receivers, Speakers etc all of which is cheap as chips at the moment.
Just because I like old Technics Amps really but I’m also betting on CD players being next years turntables.
The modding btw seems to involve soldering in new and upgraded components capacitor s and DACs and the like. The Marantz players are a popular starting point.