The portfolio case is my preferred format for knife transport (vs a roll or drumstick bag). The design, materials, and construction of the Edge Slim are faultless. The magnets definitely give a high degree of extra security — zero movement during transit.
It’s a splurge for sure, but if you can stomach the price point, I don’t know of a sleeker off-the-shelf knife case.
My standard (non-XL) model is just long enough for a 260mm edge length gyuto (HF) in a cork lined edge guard. If you need to carry, say, a true 270+ suji, you’ll probably need a XL. The center pocket will be larger in the XL too, which is a bonus. However, I do quite like the portability of the non-XL model’s proportions.