Ultimately I like both options but one slot was the first one I bought and after about a year when it started cracking I came back its Page to buy it again, saw that there is now a 4 slot option and decided to give it a try. I wouldn't recommend 4 slots. It gets the job done, but the spacer adds some extra bulk, and as soon as I moved my cards from a single slot to a 4-slot, the glue holding the two sides together started peeling. -2 stars for the 4 slot version. One slot is the one you want. Will last about a year but I think it's good enough for the price.
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