Coming from ice the biggest problems I found with inlines were slipping on corners, feeling like I was stuck on rails and not being able to extend properly in the stride. Marsblades directly improve the third and the choice of a straight 76mm setup improves the first two.
In contrast, a rocker setup or HiLo makes the slipping worse, and softer wheels make stopping more awkward. So I find marsblades a nice solution. While still not perfect when I go back to ice (my weight still sits back a bit after skating on them), they are pretty good and I enjoy skating on them. They also let me practice off ice while doing a lot less damage to my ice skating than using regular inlines.