I was looking for a "Spirooli" alternative, and found this one as well as a seemingly identical one by World Cuisine (which, by the way, has great reviews). I chose this one because the day I ordered, the price and shipping worked out cheaper. I've used it a few times to make zucchini "pasta", and it works great! Yes, it's mostly plastic, but that is not at all detrimental to the performance. My inner child has great fun making those looong strips of noodles, but since they're easier to work with a bit shorter, I cut them to size as they're coming out.
I press down the suction cups beside a cutting board to catch the zucchini "pasta". If the slicer moves around while I'm spinning the handle, I use my free hand to hold the base steady, while moving the tray handle along with the thumb of that same hand. Very simple. The core that is left over isn't necessarily waste, I either snack on what's left, or add it to the freezer baggie of veggie scraps I keep to use for chicken stock.
I can't imagine being any level of handy in the kitchen, and having a difficult time operating the slicer. Just make flat ends on whatever you're cutting, center one end onto the little tube/protrusion that holds the veggie above the blade, slide the rotating handle til the little spikes make contact with the other end, and spin. Not so complicated. Even if it were complicated, the awesome results would make the effort worthwhile.
If you let it sit after you use it, it will obviously be difficult to clean once everything dries on. I rinse everything off right away, and that makes clean-up nice and easy.