Ive also been able to check where certain people were born / what year they were born without purchasing a record which is helpful for tracking backward and double checking stuff too.
(Isolate a household by doing a blank search but put in a very narrow location and 'lived with household member' to restrict your returns. If you hover over a record without purchasing it you can see the names of 2 other people on the record plus how many more there are.
Example. I know Elizabeth Carbutt was born in Smithville in 1910. I can search for her. I can see she's now living in Jonestown. If I hover I can see she is living with Michael, Kate and 6 other people. I then can do a second advanced search. I leave both name fields blank, but put location Jonestown and lives with Elizabeth Carbutt. If Im lucky I will get just 8 returns - Michael Carbutt, Kate Carbutt, Simon Carbutt, Frank Carbutt, Fred Stone, Elsie Stone, Steve Thomas, Melissa Duke. Plus their age and where they were born.
I don't know their relationship nor jobs, but it gives me information I might not already have which I can then use to search other records. It might identify a new child - Frank Carbutt was born in 1919 and I didn't know about him. Or help identify a marriage I did not know about for example or narrows down options - I knew there was a record for an Elsie Carbutt marrying Fred Stone in 1919 but there was also knew there was one for Elsie Carbutt marrying Gary Flipper for example and I didn't know which was right)
I can't afford to buy records for every sibling of every branch of my family. One sibling I knew had married but i didn't know anything about him and he had a dead common name. Hes not on the 1939 register with her. I've been able to get the details and from that find out where he is in 39 and what his occupation was. He's interesting as it turned out he was 25 years her senior which I never knew!
My point being, you can make some use of the search if you use it well, without necessarily buying the actual record. As I say I have spent some money today, but i didn't need to buy records to find out useful bits too.