>I use it basically to make dynamic changes to DTOs , so Vfp can do real message based communications with ease.
>
>Configuration objects, parameter objects can benefit too; but I'm rounding a definitive spec to get Intellisense to work with object constructor functions that make use of _()

Be careful with many additon to parameter objects - that can really hurt performance.

Dozen years ago I was given a design already using a *very heavy* parameter object (including a couple of array properties) which created a serious brake in performance as parameter object often had to be cloned.

Ended up with a streamlined version, but still had to create an object pool for them as always creating/destroying was to expensive.
Just keep them as naked as possible ;-)