Skip the special potato slicers and gimmicky junk. They are almost always a waste of money at the consumer level. Even high-end professional options require constant maintenance to stay good.

Get a good mandoline slicer with multiple cutting plates. Throw away the useless hand guard that comes with the slicer. The hand guard can catch and slip. Invest in a pair of kevlar gloves. Here's one option that comes with the gloves you need