It certainly must be difficult to cover the vast number of new classical recordings released each year, but as the years have gone by the Penguin Guide has been really struggling to include many very important important issues. Small record companies in particular have suffered from omissions; there really are just too many to start giving examples. One thought that occurs to me- are the authors of the Penguin Guide free to review any CD, or must they only review those discs specifically submitted for review? I think we should be told, and if the latter, some small companies should pull their finger out and get review copies out.
I think the time has come for a two-volume set to do justice to everyone. In the meantime though, there is no doubting the general judgement of the authors (one does disagree on quite a few occasions inevitably), and there is still no real alternative covering anything like the number of recordings. Collectors will still find this an essential purchase.