Stay away from the IKEA "KVARTAL
" system. It will work fine for straight runs, but since the tracks don't line up perfectly, sometimes its hard to transition from one rail section to the next around the little corner piece.
Also, since the carriers are friction based they are more difficult to slide compaired to the Medical/Photo curtain tracks that have bearings or wheels on the carriers...
Something else, make sure to get a grommet punch kit. If you use or get small spring clips, you may have to put a screw or dowell inside the muslin for the clip to "bite" into. Grommets and S hooks would have been much more secure for me. Ohhh well, live and learn.