DOES ANYONE USE A RUN STAND?

I use 50/50 on my run stand and so far never a problem. It does get cold here but my igloo holds the heat pretty good here in London Ont.
I have run coolant mix in the winter here and water in the summer.
I also have re-used the “break in” coolant after installing the motor in the vehicle if it looks ok and tests ok with the guage for my non heated garage
Luckily I haven’t had any major rusty water jackets so far in my blocks.
Ghetto I know but I used a coffee filter once in a funnel after draining the block from the run stand just for fun and had 0 rust to the naked (BRRRR!) eye.