@jaz in IT, "users" is commonplace and does not have any negative connotation. Additionally, it is a social difference where "user" could be associated with something negative. For example, "fag" could be used as a negative word in the US, whereas in the UK it is synonymous to "cigarette". Similarly, I could give "member" a negative meaning, such as "member of a cult". So IMHO best to leave it as each individual's preference as long it isn't universally negative.