I have invested, shortly after it came out, but not extensively looked through it yet - I mainly invested as there is a lot of extra blurb and additional species to the Collins app, both link to each other opening the species up in the other. I saw it as extra reading to Collins which I already loved.
At least some, maybe all? videos are repeats of the Collins, so they are quite nice. The voices I believe may be at least in part or all new?
It is a work in progress that they will add to, and as I have always been intrigued by the paper set, but not the space required to store them, it was a no brainer for me to get it in my collection. Also a lot cheaper.
There are a couple of things still out of date but these are clearly stated before you buy, i.e. distribution and population, but I dare say these may be updated over time if they get enough people buying it making it worthwhile.
I would sum up if you want to add some further detail to Collins, and add some further species, they do work nicely and complement each other - Collins is a must, but BWP is the icing to what I now consider a set.
Yes, although Collins is now on Android (I refuse to have an iPhone, but love my iPads) - I have both Collins and BWP on my iPads, but only carry an Android phone in the field. Starting to get a really good collection of books on my Android phone (and iPads) now:
Collins Bird Guide (app) - only bought videos on iPad, unfortunately can’t share to my Android phone :-C and I won’t buy them twice! App on my phone is a must though!
Gulls of Europe, Asia and N. America - Olsen and Larsson (pdf)
Gulls of the World - Olsen (pdf)
Waders of Europe, Asia & N. America - Message and Taylor (pdf)
Britain’s Birds - Wild Guides (Kindle)
Also Britain’s Dragonflies (and awaiting Butterflies fourth edition) (both Kindle)
And of course BWP app on my iPads as mentioned. The only book I have not got on both is BWP, but I can live with that.
I think it is great having such good reference material in my pocket - just need Covid to go away and I can get back to using them properly.
....will also say these books are beautiful (more especially the app and pdf ones) with the ability to zoom in and out :t: