I especially liked it for using a software implementation of the USB protocol on an attiny, which means I should be able to use an attiny in place of the much larger (and more expensive) FTDI chip.
The SMD version tested out flawlessly (that's a first!). The only problem is the silk screen lettering is a bit too small to be reliably printed.
Here's the design files for anybody interested:
For sale in the Makeatronics Store.