Stanadyne Fuel Additive

Considering adding Stanadyne Diesel fuel additives to my 2003 GMC 2500HD. Any thoughts?

I use the Performance Formula plus the Lubricity Formula every fill up. Stanadyne is purty good stuff, and for awhile the only additive GM endorsed.

been using it in my 03 lb7 in every tankful for about 3 yrs...no problems in winter and i think it runs smoother