KitGuru tried the Phanteks Enthoo Pro M Glass Case
A quote from the article:
The short version of this review is that Phanteks has given its Enthoo Pro M case a minor update and has changed the main side panel for a sheet of tempered glass. The slightly longer version is that Phanteks has revised its superb entry level Pro M case by replacing one of the few weak features, a flexible steel side panel with a so-so plastic window, with a gorgeous panel of tempered glass.Phanteks Enthoo Pro M Glass Case Review @ KitGuru