Agreed on the long ones. I got a 320 ortovox stainless version. They are expensive and heavier, but it is beefy. It is also long enough to help make an impromptu shelter with my space blankets..
I have heard stories where after doing a search line, a lot of the probes are junked due to poor quality.
Remember, they aren't going into soft powder, they are going into rock hard snow. The same thing with a shovel. You aren't going to be using it in powder, you are going to use it on the hard stuff. I have been told it is similar to a furrow from a plot.. or a snowbank from a plow. That crap is hard!!!