I have the Micro Mark kit. It works, but boy, it sure is an effort. I may use it again sometime, but the effort is so great it will have to be a major project that can justify the several hours of work. I have only used it for a single project so far.
I have also used a technique called toner transfer. This only works with laser printers or copiers. I have used that for a couple of projects. It works, but does not give the sharpness and small detail of the photo based process used in the MM kit. It is, however, much quicker- about half the steps.