If I had the money I would put one of these in my back yard and sell the power back to the power company or the local town. I want one with simple mechanical controls and really good circuit breakers though. Failsafe baby, especially if there are 'unforeseen' events.
Actually, "simple mechanical controls" is exactly what went wrong with Chernobyl.
If they would have just let the system go through it's normal shutdown procedure, then nothing would have happened, other than the town being without power for about a week.
Instead, the engineers at the plant were told "Don't question the orders, just do whatever it takes to keep the reaction from shutting down! We can't afford another week to wait for the reaction to start again."
The engineers couldn't have done anything, if it was in the US, because all those controls were automated. But, in Russia, they were still 10-20 years behind in design, so manual overrides allowed them to remove the control rods -- against all safety regulations -- which raised the temperature enough to cause all the water coolant to evaporate. That is what caused the fuel to meltdown.
The safety problem with nearly all fission designs is that there is no "unplug one machine, and everything stops gracefully" option. Since Chernobyl, all reactors are pretty close to being idiot proof. There is no way to override the systems in such a way to prevent a graceful shutdown. But, the shutdown still relies on the physical integrity of the reactor and the containment vessels. Unexpected events like Tsunamis or falling bombs can cause containment vessels to break, so essentially there is no way to make such a design 100% safe. I'm still for nuclear power, because the value far outweighs the risk, but when the opposing side says that they can't be 100% infallible, unfortunately they are correct.