I like these brackets but they are in principal just assembly helpers.  I made a scaffold using them and for this purpose they worked well for me.  By using the brackets I will be able to take apart the scaffold and re-assemble it easily.  I used Kreg wood screws to assemble and added robust cross bracing and OSB decking so the stability issue was resolved.  Without cross bracing the stability of the assembly was poor.  Also the holding power of the Kreg screws and the easy disassembly they make possible are the key factor in making my project possible.  If all you need is a static assembly to hold firewood then spend the money on treated 4 by 4's, 2X6's and bolts and forget the brackets.