It includes the ultra-rare KDW-301 Dist Wah, a fantastic filter effect (lowpass, bandpass, highpass and bandpass plus clean) which can be compared to a Musitronics Mu-Tron III. The KAD-301 is my all-time favourite analog delay unit, the flanger is awesome as well (negative feedback is possible), the chorus has the silvery KORG sound that I like a lot and the distortion sounds very much like an early long-dash BOSS DS-1.
This set is worth way more than the 440 USD - the Dist Wah alone does normally fetch prices over 300 USD at Reverb!
https://reverb.com/item/91556385-korg-pme-40x-1983