I rollerblade with poles as training for cross country skiing and my husband uses classic-style roller skis (with poles). The advantage of the rollerblades is that you have a brake wheras I have no idea how you can stop the rollerskis apart from gliding to a stop. For this reason we use them on a flat closed section of road. The disadvantage of rollerblading with poles is that it's actually rather faster than I really feel safe going, so I end up doing a lot of double-poling.

If you are going to try this, I would really recommend a helmet and knee, elbow and wrist pads.