I have the looseleaf version and I love it for the ease of copying the lab pages. If I had a bound version I wouldn't get the nice clean copies that I get. And it comes hole-punched, so all I gad to do was pop it into a 3-ring binder.
ETA ~ I have no idea what the resale value is with a looseleaf copy, though. I go into all of my homeschooling purchases with the idea that I will not make any money selling them when I am done with them. If it's not worth the money to me with a zero resale value, then it's not worth owning.
Jessica, wife of Marc and Momma to Nikolai (10) and Nathaniel (9) and Olivia (3).