People thought they were getting a 486-alike when the reality was was more similar to that 386SX.
I thought the 486DLC/SLC were significantly faster than the 80386DX/SX - they had a cache that the 386 was missing. But since the 80486SX was about 4x the speed (from memory) of the 80386DX, the DLC/SLC fell way short. Anyway, I think we can agree that the 386 upgrades were a bit pish.
A mate of mine had a 486DLC/25 and it was a bit cack! :)