I decided to buy the 2013 version after some positive comments regarding sound quality start showing up on Amazon product review. After listening to the whole package which took me very LOOOOONG time, well.... nearly 100 songs, I'm quite satisfied with the overall sound quality of these CDs.
In term of audio quality for most tracks, I can clearly hear detail of most instruments. JJ's bass from the first 3 albums sound spikey with a nice touch of sub bass. The drum part sound powerful and not muddy at all. I'd describe the overall experience of listening to these 6 early albums as very powerful and energetic.
There're some tracks that sound a bit loud and a "tiny" bit harsh to my ear, which mostly belong to "No More Heroes" album. However they don't sound tinny because the mid and sub bass are still there and help balance out nicely.
In summary I would rate audio quality for most tracks as 5 stars, except for tracks from "No More Heroes" which get 4.5 stars
The double CD package is sturdy enough to hold all 5 CDs. The 24 pages booklet includes Band photos, images of albums and Singles covers, and some credits for rarities tracks on disc 5.