I have two 300's, one is "souped up" the other is stock. The fast one is stupid fast but I fear it will come apart again if I continue to push it that hard so it's been "turned down" a bit (it's still fast") The Stock on is a good stock one and a nice engine.
I also have a Td5 in a Disco 1, It's a riot!!! (and stock). It costs no more to fix than the 300's (I've had major fixes on both engines through no fault of their own)
I have no issue with either.