I have an Onion and have not used the basic one.
The model I have works excellent on everything from my Swiss Army to a 10" chef knife. I was in the restaurant business for a decade so I know the value of a sharp knife.
I had a broken belt in the kit. I contacted them to buy a replacement and they sent me an entire set, no charge.
My only complaint is the thing is built for right handed operation with no way to reconfigure for lefties. Not a deal breaker since the entire world is set up that way.
I sharpened my neighbor's knives for her and later that evening I had to take her to the emergency room for stitches.
I recommend it for everyone, except maybe old ladies with shaky hands.