I've used extensively Google Books for research of 17th century Mathematics (not just me, also the whole department were I was at that point). I couldn't have afforded to visit all the libraries to look up the originals but thanks to this repository I could download several copies of obscure works, which gives your very interesting insights: sometimes you hit a personal copy of a previous researcher, or there's an ex-libris from an old institution that you know your author was connected to, or you just discover something no one had noticed before simply with a clever string search. You can even backtrack to the forgotten true primary source of a mistakenly repeated fact for instance. It's been a blessing, honestly.
If you are into whatever not too transited alley of history, you realise soon that your (former?) company has produced a treasure trove for future generations that just shouldn't be shut down ever: there are many books there not digitized anywhere else. So thank you very, very much for your work there. It definitely belongs to the important.