Just want to plug HTTrack [1] here as well. Not nearly as slick, but it's worked extremely well for me when Webrecorder couldn't do the job. Being usable through the command line also makes it useful for some projects WR can't do.
I came here to say the same thing. HTTRACK is incredibly handy especially when it comes to old pages. My personal use case is archiving small sites to make sure they don't go dark, for example webcomics. Having a single folder with all the comic image files is great.