I had a handful full of the HPX’s to try out for the weekend. The HPX has a large yet soft tactile bump. As a comparison, it is less aggressive than something like the Anubis.
In terms of sound, I found the handful I had to test to be more clacky (higher pitched) than thocky (deep), even when the stem rails were lightly lubed with 3204.
The HPXs could be used without lubing, but I recommend some 105 on the springs to remove the spring ping.
Overall, this is a tactile I would recommend.