I looked at the inserts, and also read some reviews on this forum and elsewhere.
You bet it would save some money, and that's a good route to go if you need to.
However, I didn't want to modify my stock mount.
If there ever is a problem with my clutch or tranny,
I'd like the luxury of putting the stock mount back on before I take it in.
I do believe the design of the VF mount provides for more contact with the frame than the inserts would.
I have also read that some peoples' inserts loosened up over time.
I thougt about it for quite some time, but when all was said and done,
for my own needs/wants, it was worth the extra coin to get the full mount.
Here's a picture to better explain the frame contact area between the 2 different mounts.
Note the lower portion of the bushing is "cupped" on the VF mount.
It provides for 100% contact to the frame area.
The stock bushing only contacts where the metal insert sits.