A few examples.

How much time do you lose to re-slice an item in your current slicer because 1 parameter was incorrect ? S3D does it in less than 5 seconds, everytime, whatever the model.

How much time do you lose to re-orient models in another software (Meshmixer or whatever) ? S3D does it with 1 command : put this surface on the bed.

How much time do you lose removing support ? The Support in S3D is really well made and easily removed.

How much of a hassle is dual colour printing ? Have a look at the tutos on the website.

It probably does not do much more than other softs, but it does it really well. For me, just the time saving is sufficient to justify it.