Plenty of homemade Northill-style anchors on commercial fishing boats out there, but I doubt any folding stainless ones... Those anchors are an absolute work of art, beautifully made...Very old design, not seen much anymore. I used one in the late 60's but haven't seen one on any boat other that a commercial fishboat for ages.
Probably ok as a 3rd anchor - new gen anchor on the bow (Rocna, Manson), Danforth as a stern anchor.
I have an 18 pound Danforth and a 27 lb Danforth and a 15 lb Bruce claw all on 27 ft of 3/8 chain I also have a medium box anchor that I fouled on in liberty bay a couple years ago thought I had drug until it came up hanging on my 18 Danforth. Here's a link to the box for clarification https://www.slideanchor.com/Hlm_ShopIT_ProductDetails.aspx?ID=024a8189-c4ba-41dc-9a41-c5e749bb8688I'd say so. You cannot buy many good 20 lb anchors for $100.
What other anchors do you have?