The only problem I have with slugbox is that they delete galleries every few weeks. This was true back on Tumblr, and definitely true of twitter (says so in their bio)
I've basically made some peace with this fact since I failed a long time ago to keep an active eye on them. You'd think though Slug would like make their work part of a large series of gumroad packs. They'd get posted here probably, but a crap ton of people would definitely pay to get an assured download of high quality and ancient Slugbox art