I have a can of the 50:1 for emergency use. I like the fact that it has E-0 gas (here in Central Fl, E-0 is impossible to find).
I mix my own during summer season, with Sta-Bil marine and Amsoil Sabre Pro. Near the end of season, I run a tank of this stuff, as I don't like to keep any ethanol in the carb, even though I drain and run dry.
The manufacturer says an open can is good for about 2 years.
I rarely like spending that kind of money. But one can every year is not that bad to me.