Very happy with this purchase =) Sorry for the blurriness.
I was debating between this and the 25 key.
It was actually a hard decision.
What the 25 key has that the 37 does not:
joystick, arpeggiator, sustain/tap button.
What the 37 key has that the 25 does not:
An extra octave, wheels, two usb ports.
I was originally leaning toward the 25 key, because it could fit in my backpack, but decided to go with the 37 key because of the extra octave and usb ports. I can buy a bigger backpack at some point =)