(I'm the datacenter manager at imgix, and wrote this post)

Yep, there are lots of other options out there. I considered at least 4 or 5 off-the-shelf ones before committing to designing and building our own.

In Sonnet's case, it is super expensive and no denser than this: http://mk1manufacturing.com/store/cart.php?m=product_detail&...

We're able to achieve twice that density, which put it right on target with where I wanted to be. 44 of 48 switch ports utilized, almost all CDU outlets utilized, and ~13kW out of 14kW utilized under load.

Yeah I saw it was half the density. Too bad they're so expensive. On the plus side... you can actually buy them :)

True, but now you can buy our chassis from our rack integrator (in sufficient quantities), and I'm hoping they'll be able to open source the design. If you're in the market, contact me.