I agree, the big old Macs are just so fun to run, there is nothing like them.
Right Don't retire it as long as it's running good.
I do not own a 250 but I have it's smaller cousins, (not smaller by weight)
I have some of the old 1-40, 1-50 series and I normally always take one of them to the woods along with my lighter Stihls and when I get a big log down I lug the old heavy Mac over to the log set it on top of the log, hold the throttle down with one hand and drink a cup of coffee with the other while the big old heavy saw uses it's own weight to do the cut. Do not even have to use the spike or lay on the saw. Those big tooth .404 chains are easy to sharpen also. I do not let my old Mac's lay around un-used for very long or the carb insides gaskets will dry out, especially if stored in a hot area.
They need to be ran every once in awhile to keep them limbered up and ready for the wood.
Have to stay awake and not forget to do the manual oiling on the old Macs after running the auto oiling saws.