They look OK, use search to find out what modifications people are making to them.
I saw the gs23 in action on heavy clay & it was breaking the clay very well.
Most HBs work when set up correctly, once again use search.
Read the walbanker thread, you don't have to have one but there is a wealth of information. Look at the goldhog video's, you don't have to have their products but there is lots to learn and apply to whichever setup you use.
Consider the weight of the sluice, pump, hose & all the other gear it is necessary to carry.
It is good not to have the pump flatout for pump longevity and the noise which will eventually bother you.
Now using Wx15 and an 8" goldrat HB that works without mods. The fewer components & simplest setup is best for me.
You have to be confident in your gear, good luck.