There used to be arguments among memory upgraders about whether to use sockets or not. There are some 128K boards which just don't have enough juice to drive the extra capacitance sockets add across address lines (about double that of a chip soldered directly to the board). Generally, I like socketed chips for ease of repair, but I found too many early Mac boards simply got flaky, so I quit using sockets. Desoldering & removing all the sockets you've just installed will discourage you fairly quickly. I also found the NEC ceramic chips I preferred for upgrades and repairs simply never failed, and were quite safe to solder in place.

One upgrader claimed that his boards using socketed chips would be upgradeable to 2MB using 1 Mbit chips when they became available. Those of us who could count to 16 pointed out to him that with 16 pins, the max size chip you could have was 256K, but he never understood, and was very surprised when 1Mb chips turned out to have 18 pins, and didn't fit his sockets. xx(