Comparing Adafruit's Pro Trinket to Trinket and Uno

A few weeks before Getting Started with Adafruit Trinket went to press, Adafruit introduces the Pro Trinket.  It hits a sweet spot in terms of price, performance, and size between the Trinket and the Arduino Uno.  In my comparison chart in the book it was a bit late to add the Pro Trinket so I'll do it here. First, sizing them up visually:

Adafruit Trinket (top), Pro Trinket (middle) and Arduino Uno (bottom) (source: Adafruit)

The Pro Trinket is closer to Trinket's size than an Arduino Uno.   It's smaller than an Arduino Micro or Nano I believe but not by a lot.

	Adafruit Trinket	Adafruit Pro Trinket	Arduino Uno
Processor	ATtiny85 Surface Mount	ATmega328P QFN package	ATmega328P DIP Package
Digital Pins	5	12	14
Analog Pins	3 (shared)	8	6
Pulse Width Modulated Pins	3	6	6
Pin Voltage	3.3 or 5 volts	3.3 or 5 volts	5 Volts
Board Voltage	3.3 or 5 volts	3.3 or 5 volts	5 Volts (3.3 on a pin)
Regulated Current Out	150ma	150ma	800ma
Power via 3.7V LiPo	Possible	Possible	No
USB Chip Onboard	No	No (but has FTDI header)	Yes
USB Plug Type	Mini-USB	Micro-USB	USB-B
USB Programmable	Yes	Yes	Yes
Memory (RAM/EEPROM)	512 / 512 bytes	2048 / 1024 bytes	2048 / 1024 bytes
Flash Memory (free)	8K (5,130 free)	32K (28,672 bytes free)	32K (32K free)
Add-on Shields	No	No	Yes
Board Size	31mm x 15.5 x 5mm	38mm x 18mm x 2mm	75.14 x 53.51 x 15.08mm
Approximate Cost	$6.95	$9.95	$24.95

In terms of Pro Trinket compatibility with Uno, the Pro Trinket does not have digital pins 2 and 7 exposed to pins (they are permanently used for USB, although you could hack into the USB resistors with very fine wire to get them).  Sketches that use pins 2 and 7 may most likely be modifiable to use other pins.

Like some Uno clones, the Pro Trinket adds analog pins 6 and 7 which could be very useful in some applications.

What do you think?  Does the Pro Trinket fit in well in the spectrum of available microcontrollers?  Capability, price, size?