They have been on 600km dirt/tar day rides, highway trips, and used for everyday use such as carrying shopping 25kms home. The good news, I didn't crash test them or have my bike fall over off the side stand, so I can't say they are indestructible. Being a hard pannier (Tusk) type person I really liked them.
The work-in-progress universal mounting system is amazingly simple but very effective and captures the pannier so there is virtually no chance of it ever falling off. I really liked the locking idea to secure the pannier to the mount, and the lid locks can hinge forwards or backwards for loading or unloading. I'll admit to not 'homing' the latch properly sometimes and riding off, but still never had the latch undo or lose the pannier lid.
These are only prototype 30 litre panniers but still carried most of my excessive toolkit for the long rides. I haven't had any rain for last month so no water leaks evident, and no dust entered the panniers due to the 20mm high lip and quality seal used on the lid, so should be waterproof.
The panniers didn't rattle or make any noises with their mounting brackets. There is a cutaway on the lower leading edge to reduce the chances of leg entrapment if paddling in soft conditions.
I know many of the serious dirt riders will only use 'soft' panniers in case they fall over, but seriously, many riders are packing their heavier items down low in soft panniers, and filling them too full, which virtually makes them a firm to hard pannier anyway if they fall over.
Adventure First have more changes planned for the next prototype. I am happy to have had a chance to use the product, and to show it to various adventure and road riders around northern NSW for comment. I have not covered every little detail involved with the panniers (like being able to use 50mm wide straps to secure items on the lids) and their construction." - Mac Eggins