[mtoader]

Interesting concept (one that i actually stumbled upon a couple of years ago).

If i would venture to guess why people don't use it more often i would say that it's because the marginal win (ease of debugging for a certain class of hard bugs) is smaller then the hassle of changing the complete toolset (current debugger and tools).

My guess this kind of tool is really good at a small class of hard bugs (which in general are pretty rare). For all the other the current tools are good enough so a switch would be costly for no immediate gain.