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Yes. I used them for a couple of years and even installedthem in my Roland plotter to plot circuit boards. They did an excellent job (ifyou were lucky) and if the correct ink is used it is VERY resistant to etch.This was my only method of making boards during that time. But then I got alaser printer and abandoned the plotter and ink method in favor of tonertransfer. I would never go back and quite frankly I'm not sure why anyone is consideringgoing back to markers and technical pens when toner transfer works so well.
The technical pens and plotter were simply apain in the butt. I was using the smallest ones available (0.3mm I believe) andthey had to be taken apart and cleaned after every use. There was an extremelyfine wire inside used as an ink release valve and it was sure to get bent whendis-assembled. The pens required special cleaner to dissolve the ink. The pensfrequently skipped when used on copper (rather than paper as intended).
For what it's worth Eagle can still generate plotfiles for the Roland plotters but the plotters require a parallel port (rarethese days) and drivers for same AFAIK do not exist for the plotters any more.
Forget the markers etc. and use toner transfer, it'scheap and easy.