I did not have 4-LOM as a kid, but always loved the concept of a protocol droid gone wrong. I also always loved the insect-alien head on this guy. Just another level of cool that comes from the designers and builders on the original trilogy, and the forced creativity of not having an unlimited budget and CGI effects back in the good old days of Star Wars movie making.
I found this one at the flea market recently for fifty cents! He's in near perfect condition, and I am pretty excited to finally have him in my collection.
I believe there has been at least one more updated 4-LOM released by Hasbro, with probably eighteen thousand points of articulation or so. Maybe someday I will track that one down too.
Either way it's fun to have these two. Because two 4-LOMs are better than one!