Can't say that I've ever really seen anyone post about the Darwin SE. But it is essentially just like a Rolls razor, which do get high marks. But since it is a different shave system alltogether, I don't think they compare.
They are, and when you find them usually quite inexpensive. I picked up three for extra blades and parts. They usually come with two blades, one set had one blade missing, another a bit of corrosion one one blade, so I have 4 almost mint blades.