$1500 expensive? Really? I don't understand this logic, plenty of us pay $80+ plus per tire that last a month. Or $2K+ for wheelsets, that arguably make very little difference to the vast majority etc etc. But spend on a set of shoes you wear every day for 2-5 hours at a stretch and where comfort is a primary concern and people look at you like you're a freak.
I've never heard of these shoes before this thread, they do look great like the early Bonts (which I've owned many pairs). Like the early Bont's they seem to be lacking a few features that go into the durability category. Some type of covering on the toe box (toe overlap > eats expensive shoes), and the sole needs something more substantial on the heel/toe for walking in them 5g of plastic yes adds weight, but stops you eating a very thin carbon sole very quickly.