I've used the HE for many dive environments from the 32% 3+ hour bottom time,to the 21/30 90 min bottom time,to the 12/60 300ft+ cave dive. I've been very satisfied with its performance and ease of operation. I've used it with buddies using the VR3 and we typically get out of the water in very similar times if not me getting out sooner.On one cave dive I do I hate diving with VR3 owners because the first part of the dive is a short deep stretch,then you go shallow quickly,I always have to spend 4-5minutes waiting for them to clear deco. One thing I like about Dive Rite as a company is their company service and response time to getting something back to you.