Have an H2 now, have an opportunity to sell it to a friend and get a new H3 for an extra $200. One thing i know is improved is noise which is definitely a bonus for me since it will help keep the noise levels down for when my wife is studying in the evenings or sleeping in some mornings.
Is anything else changed between the units? Is response to terrain changes in Zwift for instance any better? Is reliability improved? I did not find many actual differences.