If it's using a milling machine to cut the PCBs it's neither cheap (breaks a few end-mills per project), instant (have to redo the board several times to fix milling issues) not very useful (1 layer, huge tolerances)...

It's quite a shame the "fablabs" have chosen to go with that approach (for philosophical reasons mostly, I guess, as the milling machine could also be used for other purposes) rather than a decent simple etching process.

Sorry for the rant, I've seen a "fab academy" student struggle with the process quite unreasonably during the last few weeks...