Soft mounting kind of depends on the fsituation that you are in. If you have a really lightly built fuselage, you may want to consider soft mounts. If you have serious noise problem, you may want to consider a soft mount.

On the other hand, most 2 strokes have less vibration than equal or larger 4 strokes. If you have a pretty strong engine mount and fuselage, you probably don't need to soft mount. balance your props as best as you can and a large percentage of you vibration will disapear. Increasing the diameter of your prop will help decrease noise.

It's a matter of personal choice and how much you want to spend. Sometimes you have to consider the cost versus the reward.

Silversurfer