I'd love to have 100 of them! It probably wouldn't be $0.75/ea for only 100, probably closer to $1.00 each, but still. $100 for 100 MCUs to throw into projects would be awesome. 48Mhz is a lot of hertz to throw at a lot of problems.
Hell, at that price, you can afford to do stupid shit with them, like put them in your friends' LED lightbulbs to screw with them, or build a physical neural-network computer, just so you can hook up LEDs between all the interconnects and make a blinklichten display.
The only problem is that they are ball grid array devices. I wouldn't necessarily say that BGA is impossible for a hobbiest, but typically you're just not going to find that kind of equipment at your local hackerspace.
In some ways BGA is even easier, aiming a hot air gun requires less general accuracy than a fine soldering iron tip. The only difficult part is the size of the things.
Though, if the goal is to have a really cheap, programmable chip that doesn't consume a lot of power, then the MSP430 is probably a better bet. 16MHz MCU with admittedly very little memory of its own for about $0.35/ea for a thousand.
Hell, at that price, you can afford to do stupid shit with them, like put them in your friends' LED lightbulbs to screw with them, or build a physical neural-network computer, just so you can hook up LEDs between all the interconnects and make a blinklichten display.
The only problem is that they are ball grid array devices. I wouldn't necessarily say that BGA is impossible for a hobbiest, but typically you're just not going to find that kind of equipment at your local hackerspace.