I was reading the comments on Adafruit's post for the product and they appear somewhat mixed. I would tend to expect this myself. Why?
- The Freetronics LeoStick came out many weeks ago and is priced at $28.50 shipped in the US from reseller EpicTinker or direct from their Australia based operation. The product plugs directly into a full-size USB port so no cable is needed for programming or interfacing as a USB host. It also has headers (not standard shield compatible but you could make your own).
- The large number of small form-factor Arduino-compatibles. Very successful Kickstarter projects like Digispark and TinyDuino bring compatible devices at around the $22 mark (about the same price as a full Arduino Leonardo.
- The new 32-bit tiny powerhouses led by the Teensy 3.0 at $27.95 US have much of the power of the Arduino Due in the small form factor.
The Prius was the first mass produced hybrid and has a strong following. But there are many electric or hybrid cars now, some rather reasonable. Does one stick with the market leader or consider something like the new Tesla Model S? The choice is yours - viva la choice.