Why would i use this over a VPS? A VPS is a similar price and has similar functionality, but doesn't pose a security risk to my home workstation and comes with a slew of other benefits. The tech looks reasonably cool, but what is the use case? EDIT: Your site also makes it sound like it is HTTP(S) only. If it's not, you might want to clarify that.
Thanks for bringing HTTPS up, that's another good use-case for Showoff. If you're developing a web app that needs to be tested with HTTPS and don't want to mess with creating a self-signed cert, Showoff can help you out. It's also really nice for testing web hooks or API callback URLs against a local web server (e.g. ecommerce sites with IPN, &c). If you sign up for an unlimited account, you can choose a permanent UR…
Working independently on a project or projects with distinct clients who either need or want to give input/feedback on feature development can be greatly alleviated: work up a quick prototype, show off from my local dev machine (never have to touch a server), call/IM my-name.showoff.io, and they get to see it right away, in the same medium they will eventually be using it. This is so much nicer than sending a wireframe or design of a feature.
The long-term benefit is that the my-name.showoff.io URL can be pretty easy to recall & reuse for any number of clients & features.