The problem with Inon and Sea & Sea strobes, mostly on the high end, is that they're punching up the power, but not doing much about heat dissipation, making it increasingly likely to burn out the tubes by thermal overload. Ikelite's strobes are big, so they're better at absorbing the heat, but you've got to deal with the bulk. Best of both worlds is probably Retra, with an aluminum housing that is roughly the same size as a Z330, and using standard AA cells (up to eight of them for faster cycle time), but it comes with a certain price premium.