It is so dynamic and clear and exciting to hear the bass, different guitar parts, and Ringo's drumming
Ringo is a much better drummer than I thought, and Paul is a much better bass player than I ever dreamed. The early albums have kick drum and bass line that I never heard. Also, I am listening to She Loves You, and I can hear both guitars for the fist time ever.
On the subject of drumming are Brian Purdie's overdubs on any of these? I don't think they are unless some of the masters were the ones for the later US releases (Bernard Purdie is rumoured to have overdubbed around 21 tracks mostly the Tony Sheridan Hamburg stuff with drummer Pete Best but also a few others (mainly to fatten the drums with more punch and consistency - apparently, George Martin was not hip on the evolving Blues drumming sound that Ringo used in the early days and preferred a more precise beat which Ringo later adopted)
Incidentally "She Loves You" is one of those rumored to have been overdubbed by Purdie.