I had a Kreg R3 - an older one that came with the Vice Grip clamp.
It worked great.
Then the word went out that Kreg was doing away with the K3 Master in favor of the K4 - some sort of patent dispute....
I jumped all over a K3 Master when I saw them on the shelf at Hartville Hdwe. a few months later, after all the online sources had dried up.
Honestly though - if I were to replace the K3 tomorrow it would be with the Harbor Freight version.
It's actually better made than the Kreg. It's all metal, not plastic.
https://www.harborfreight.com/portab...kit-96264.html