Class 1 is no problem at all. Class 2 takes 'due diligence' on your part. It will handle some pretty rough stuff but...........

If you are familiar with any of these rivers I had no problem with them at all:

Arkansas:
-Little Red river from the dam to swinging bridge.
-All of Norfork river.
-Spring river from dam 3 to Riverside Resort
Tennessee:
-Caney Fork from Kirby to the Congo and back with 2 generators running.

I'd say it's downfalls are:
-water over the bow without a middle skirt on.
-high-angle lean overs
Water can enter the craft in those situations.

It is VERY stable in straight line rough stuff.