I've had my PRS500 about 18 months or so, use it every day and still only charge about once per month.
I have bought a huge number of books from the sony store (courtesy of folks here with gift codes), was all excited to finally see a UK release, only to have my hopes dashed when Waterstones announced they only sell ADE books (which the PRS500 can't use).
Recently been buying books from fictionwise and converting them to *.lrf
Do I still love my Reader? You bet I do