Compared to cases that have mounting on inside of case, these slider based ones are far more hassle to work with(difficulty with screwdrivers due to tight space and sliding clamp not working with different screw heads as users are forced to source their own screws to fix pci cards in place) and most cases that use this design(case makers who are trying to cheap out on materials) dont include screws for pci brackets which will work with clamp.
I disagree. In my experience, internal PCIe screws are almost always obstructed by overhanging case frame elements, requiring an angled screw driver with sub-par grip to access (some cases have cutouts above the screws to alleviate this, which brings with it its own set of issues using thicker multi-bit drivers). They can work fine, or they can be a hassle - just like external ones. Unless your screw driver is very short (which would be equally problematic in either case), there's no tight space to speak of on these external ones - clearance from the side panel is literally identical to an internal bracket, just on the opposite side, and in the other directions you have clearance to however far away other stuff in the room might be. Also, in my experience this design is
not used by case makers trying to cheap out - those tend to reuse old tooling with internal flanges, as tooling is what is truly expensive, not materials - but rather those wanting to maximize internal space for a given case size, removing the internal offset of the motherboard and PCIe devices. Also, the clamps have cutouts for screw clearance - they're meant to clamp down on the bracket, not the screw. You can clearly see the screws protruding out through the clamp in the product photos.
The only real drawback of designs like this is that you need to slot the PCIe I/O bracket through a relatively slim opening (where the sliding clamp goes) rather than just putting it in however you please with the internal style of mounting. IMO that's a more than worthwhile tradeoff for the increased internal volume this mounting style allows for.
To me - someone with quite a bit of experience using both types of case design - this looks like an easily accessible, space efficient and reasonably well executed design.
A valid opinion, but 25mm feet are very common on some of the most popular cases sold today - LianLi 011D (even the mini), almost everything NZXT makes, Fractal Torrent - to name just a few.
True, but even the O11D Mini is notably taller than this (~5cm taller), which alleviates the visual imbalance of taller feet. They might have gotten away with 20mm, but 25mm would likely have started looking precarious and unbalanced.
