One other reason is indicated in the TESB radio adaptation: Vader had been humiliated by his prisoners and he wanted some payback. What better way to do that than encase Han in, essentially, a block of stone and force the others to helplessly watch. And that fact that Han would, possibly, live through the whole thing made it even worse. Don't forget, Vader can be one mean so-and-so when he wants to be.
Wait, what? I have Bounty Hunter, when did this happen? Personally, I'm so happy the carbonite is gone...
The carbon freezing facility the Republic had was a proper, high-end one, while the one on Bespin was "crude", like Vader said. In fact, its use in The Clone Wars does sort of explain how Vader would know that the Bespin freezing chamber was crude.
@CT-867-5309, it was right before the first boss battle against Montross, second level on Coruscant. Or did someone skip the cutscenes?
There's procedures specifically for freezing humans, I imagine. Don't forget, colonists aboard early sleeper ships were frozen in carbonite for the journey.
The Bespin facility was an industrial freezer, meant to freeze carbonite gas, not organic beings. I'm curious where the life support controls came from. I can't imagine a normal carbonite slab of Tibanna needing that sort of controls/sensors.
It seemed as if the machinery at Cloud City was meant to be used in a more industrial capacity rather than a medical one. And as others have pointed out; the equipment was considered crude. There's a difference between a medical laser and an industrial laser, and I don't think you'd want someone to use an industrial laser to break up your kidney stones...sure, it might work, but the results might not be pretty ;p
Wow...that guy just complained that Obi-Wan "wines like a woman" Like a woman....god, every time I try to watch these "brilliant" reviews I just get more annoyed.