allemanderThe 5 is way too thick and heavy for my purposes. Like you said, that thing is a tank; definitely a SHTF type knife. I'm jumping on this 6 just because I can't wait and I have heard some people are not happy with the small handle on the 4.
T-RavYou'll love the 6! I've had nearly all the ESEE fixed blade models for several years already and the 6 & 3 are my favs. The handles on the 3 & 4 are interchangeable and the 3 is a little thinner than the 4, but yeah, without much contouring and no palm swells, the flatter handles on the 3 & 4 definitely don't work for everyone. The 6 has a beefier grip and its handles are interchangeable with the 5.