OK, DS has now read all the books, and we finally had time to have a proper chat about them, so can finally give some feedback!
Many thanks once again to Pearson: DS loved being 'chosen' to give feedback on the books and is really looking forward to future packs arriving over the coming months 
Q1 Which pack or books did you and your child review? Was the pack of books for "learning to read" or "reading together"?
We received the whole set of Bug Club Year 2 books 
...for which many many thanks, and hence the slight delay in providing full feedback as DS was determined to read all 24 and discuss properly before I was allowed to respond! The books are "learning to read".
DS (currently age 5, turns 6 next week) is going into Yr 2 in September, so I wasn't sure what to expect. He read all 24 books completely on his own :)
Q2 If a "learning to read" pack, how do the books compare with the reading practice books your child brings home from school? Which reading scheme does your child use at school?
DS' school use a mixture of schemes. The Orange/Turquise and Purple packs all seemed a bit simpler/easier than the books DS has been reading at school at the end of Year 1. Each book took about 5 minutes, which is a bit short. The Gold/White and Lime packs were a bit more challenging but still too short.
Q3 Would you say your child enjoy reading or looking at the books? Why/why not?
He very much enjoyed almost all the books. He thought the subject matter of the non-fiction books was well chose and interesting, even the ones that he commented were 'too easy' such as 'Fun Festivals' and the books about animals and the environment.
DS hugely enjoyed most of the fiction books with the exception of 'Caspar'. I think there is a general issue with basing reading books on television characters in that a) not all children will be aquainted with the characters and b) it suggests tv watching is somehow necessary and c) in my experience books based on television series are frequently less well structured and more infantile than non-franchise fiction.
The exception to this would be the Jedi book; although DS had no idea what or who a Jedi was, the book was very well structured and clearly conceived - even though he won't be watching the Star Wars films for some time...
Q4 What's your overall review of the book pack?
Great subject matter, but the actual books were too simple/easy. Fantastic mix of fiction/non fiction and impressively non-gender specific.
Q5 And what is your child's review of the book pack
He loved almost all the books but thought they were 'too easy'. He would have liked most of the books to go on for longer and to go into more detail.
The exception was the 'chase in...' series - he loved the first one (Chase in NY) but pointed out that the plot of the second (Chase in the Rainforest) was almost identical (ie there's a 'twist' at the end in both) and he was disappointed as he had been looking forward to the second book.
Q6 Would you recommend these books to another parent? Why/why not?
I think they would make great Year 1 reading.
Q7 Do you think your child would recommend these books to their friends (if they are old enough!)? Why/why not?
Mostly not, although most of ds' friends would also love the subject content. Having said that, DS has donated quite a few to a collection I made for families made homeless by the recent London riots as he thought they might help cheer up those children who had lost all their toys etc
Q8 What star rating would you give this pack of books overall? Please use a rating system out of 5 where 1 star is poor and 5 stars are excellent.
3/5 : subject matter was fantastic, but the actual reading level was too low.
We're looking forward to the next pack! 