I purchased this rack a year ago and have been on three short, week long, trips so far. I have the disc version.
As for the strength, I would say it is fine.
I've taken about 25 lbs of stuff on super bumpy gravel roads without an issue. I've even given my 45 lb niece a ride.
The bolts that hold it to the eyelets at the wheel aren't really any longer than a standard rack bolt, if that is what you are worried about. The hole in the rack for the bolt is recessed quite a bit.