Assalamu alaykum wa rahmatullah wa barakatuh
Yes, alhamdulillah, it is useful for when a book is rare or unavailable.
Here are a few photos of the Im'an al-Nazar they printed. I chose the 8.25in x 10.75in hardcover casewrap binding. As you can see, some of the pages are slightly cut off (just the page number and top of page) but all the text is still there. This is partly my fault for not making the PDF page size match the size Lulu instructed me to use. Any crooked pages, badly scanned pages etc. in your source PDF will also be reflected in this printed copy. Also, since Lulu is meant for English and other left-to-right languages, you basically have to reverse the PDF so that it thinks the front cover is the back cover. That is why the barcode is on the "front cover" in the photo. So, the back cover and spine get the title/author, which you cannot type in Arabic as far as I know, so I typed it in English.
Unfortunately shaykhuna, I don't have much of a digital collection, I usually just Google whatever I need if I remember there was a scan for it somewhere... saving it would be much better though, as links go down all the time, and insha Allah I want to start a folder where I save all these books.
As for Im'an al-Nazar, here is the link to the scanned copy: https://archive.org/details/ensnf
However, this PDF is missing pages 130-133. There is also a scanned makhtut copy (Al-Maktabah al-Zahiriyyah 228) which I tried to copy the missing part from (but I couldn't make out every word): http://www.mediafire.com/view/k17z7limolrwuq9/إمعان_النظر_لمحمد_أكرم_السندي_ms~20141209-030856.pdf (text corresponding to the missing pages starts around bottom of page 93)
Alhamdulillah, I just found another scanned manuscript while searching for this, which insha Allah I will use to fill in these missing pages in my printed copy completely: http://www.alukah.net/library/0/66916/
Also some discussion about the book and this edition: http://www.ahlalhdeeth.com/vb/showthread.php?t=90998