Prior to purchasing my 755 in 1993 I had a 430 with the 54 inch blade, wheel weights, and chains. It did an adequate job pushing snow. When I got my 755 I also purchased the 380 front blade. The 380 was available with 54, 60, and 72 inch widths. Mine was 60 inch. As Kenny said, it is very heavy duty. Without using chains, the MFWD and greater weight of the 755 did much better than the 430. It did best with the weight of a box blade on the rear. I expect with chains you could do even more, but I have not needed them.
A couple years after buying the 755 I added the 70 loader. After that I only used the 380 blade about three years because it required removing all the tractor brackets for the 70 loader, and installing a different set for the 380 blade. It definitely was not worth the trouble. So I then bought a rear blade with skid shoes and every year I still appreciate not dealing with the hassle of changing brackets. Using the loader and rear blade for snow is not as convenient as a front blade, but that's OK. Still easier than brackets, especially since there have been some years I hardly needed to plow at all.
After it sat idle for many years, I finally sold the 380 blade last winter to JD25201965 who modified it to fit his 2520. Significant customizing job similar to what Kenny did. Maybe I can get him to post pictures some time. He previously posted pictures of the work he did to change the seat on his 2520.
So all in all, the 380 is very heavy duty, very nice, but not something you want if you also have the loader. As others here have found, in that case, it will never be used.