I've personally never replaced an MP301 drum with the type 301 drum, I've always just snapped the locator pin off the the machine and popped in a Type 1515 unit.
Cost has been the primary factor as the type 301 units are about 70% more expensive in my case, but I also never had an issue until about the last 1-2 years.
There seems to have been a manufacturing change in those units as well that's made them less durable. One indicator is they now have a black handle rather than a green one.
They've been failing WAY too soon as well (at least on the MP301's). Similar to JayPaul, they often seize up between 10-20K.
I've recently been installing a generic version of the type 1515 units to see how the performance is, and figuring that they almost can't be any worse at this point.
It's still very early in that game, but I've not had any known premature failures yet.
Just curious on thoughts about the Type 1515 units, and any insight on possible manufacturing changes that have caused them to be less reliable too?
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