For those curious about the desks but haven't contacted me about them, the glass desks commonly shown in Phoronix photos are all the Walker Edison 3-Piece Corner Desk. The L-shaped glass desk is made of tempered glass and steel tubing. I've been using them for about five years now and am now up to my fourth purchase of the Walker Edison 3-Piece Corner Desk.
I've yet to have one of these desks break or cause problems, but simply buying more as my office expands and need to accomodate more hardware. Just last week was my purchase of the fourth desk and this glass L-shaped desk cost just $75.02 USD! I always purchase these desks through Amazon and the price seems to vary from time to time from $75 up to $125, but regardless it's a bargain.
There's a few different varieties on Amazon as the prices vary from black or silver colored steel tubing to a black glass version. There's also a slide-out keyboard tray on the desks too, and a seperate "PC stand", but I personally don't use those simple stands that elevate it a few centimeters off the ground.
Assembling the desk is very easy and versatile -- for my most recent addition, I decided not to use the corner piece and just make a longer straight desk, in the past I've made other modifications too like reinforcing the metal tubing to handle LCD monitor mounts. The only issue I've ever encountered with these desks is that wanting to reinforce the tubing with additional metal when using multi-monitor stands that clamp to the metal/glass in order to mitigate the risk of potentially cracking the glass due to the additional weight.
On my main desk I have an Apple Thunderbolt Display, 30-inch Samsung monitor, and a quad-LCD display setup using a monitor mount and I have yet to run into any issues with the weight or this sub-$100 desk failing or causing any sort of issues. On another desk I have a dual LCD mount with 22-inch displays and on the other units I have various open-air test systems and other hardware. (For those curious about the monitor stands/mounts I prefer, they're the very interesting Tyke Supply LCD stands.)
For those looking towards a low-cost L-shaped (or can be made straight if ignoring the installation of the middle curved section) glass desk that is built well, easy to assemble, and quite flexible, I would recommend the Walker Edison 3-Piece Corner Desk. If using that link or our Amazon link you will earn us credit at Phoronix for your purchase(s).