Spearfishermen are fortunate to have Dano ==a one stop shop for all modern spearfisherman's needs == No need to experiment, no need to shop around.
I had a chance to shoot one of Jack Prodanovich's "more recent" big guns during diving trips off Baja (Mexico). It belonged to a friend who owned the yacht. It was easily the best pipe-gun I ever used to that point in the mid-1980s. I haven't shot any of Mako's longer guns but I can honestly say that they are a significant advancement. I was never a fan of the wooden guns, more from an emotional perspective than functional, but they have also come a long way.
Unless I missed it, there doesn't seem to be any recent developments in the pneumatic gun market. Did you guys experiment much with them?