The part I don't find appealing of the photo sensitive etch resistant approach is the ammounts of steps in the process, first you need to print then to apply the photo resist (using the photo resist sheet instead of the ink seems a reasonable approach, a friend uses than and has no trouble) then reveal, clean the PCB and only then go to the etching. With toner transfer you save a few steps, no exposing or revealing but you still need to clean the board but with water, so much less messy. Over all it's cheaper and faster and I'm pretty happy with what I get from there.
The only reason for me to get the insolator would be if going for solder mask application, which would be nice but I don't think I'm doing that any time soon, looks like too much for the self etched PCBs, if I had a way to make nice vias and align really nice the two sides I might then consider the solder mask...
JS