This is brilliant.
Some of the tracks on this sound dated, and some of them are truly awful! But they are the minority, and remember, this is a "History Of" not "Greatest Hits Of".
At over £50 it's probably only for enthusiasts. The sheer time and effort that has gone into this compilation, and over 200 tracks, many remastered, luxury packaging, and book make this well worth the money.
One tiny complaint - there are supposed to be 6 bonus tracks available for download. One track is missing (it downloads an empty file). I emailed the download website but they did not reply.