I used glitch in my classroom for the last couple weeks. It was a great way to get students to stretch a bit and try new things. Here are some things I observed.
The interface is a bit clumsy to students who have not been exposed to a development environment other than codedotorg. They miss the ease with which they can add images to a weblab project, skeleton html in a new html file, ability to preview a page by selecting the file name on the file panel, and the most valuable feature they miss is the autocomplete for html tags and css rules.
On the other hand, I was thrilled students could work simultaneously in groups of two or three on the same project. Well, almost! Once in a while there would be an exasperated sigh that they were having a glitch (403 Forbidden error). I considered this a wonderful teaching moment. They did not lose any work. Oh! there was a way to rewind or look at the history of the pages they were building. This was useful for those oops moments when someone accidentally changed code that a peer had written.
On the whole, I was happy to have discovered glitch to allow my students to work on team projects that they can add to during the year.