i own one or two fiskars cutters, several dritz cutters, and several of some wierd brand i got for $1 each at Big Lotts.
the first fiskars i bought fell apart. i bought another because it used to be the only brand they sold at WalMart and the only brand i'd ever heard of.
by the time i decided i wanted one with a bigger blade, WM was also selling Dritz cutters. they were less expensive than fiskars, so that's what i bought.
i like the dritz much better. they are sturdy and stable. the fiskars cutter feels flimsy, wobbly, and generally like junk in comparison. much easier to achieve an accurate cut. it's easy to take apart and put back together. in fact you can't put it back together any way but the right way. it cuts easily through as many as 8 layers of fabric. and they are safe, safe, safe to use. i did manage to cut myself once but only because did something incredibly stupid while using it in a way it wasn't designed to be used.
i treat my cutters like i do my computers. i push them to their known limits and beyond. i have used the dritz; abused the dritz; but i have not been able to make it feel cheap.
far be it from me to discourage independence and exploration of new frontiers. i hope you find something that cuts fabric as easily as a rotary blade. especially through more than one layer. when i first got into quilting, i tried box cutters and craft knives. i already had those and didn't want to pay for a rotary cutter if i didn't need to. neither worked well at all for me. So if you haven't tried a Dritz yet ....