I also have an Izip (2015, large size). The new Dash models have mid drives so hills should not be an issue. I am 5'8" and the reach was too far for me. I changed the handle bar to a swept design.I have a 2014 Dash with about 2500 miles on it. Used primarily for commuting and sightseeing. I am 6 foot and riding a large. I would probably go for the smaller frame next time as I’ve done what I can to “shorten up“ the reach and I still feel a bit stretched. I have commented before on this forum that this is the most stable platform I have ridden and I have ridden five different manufactures products quite extensively. This makes for a great commuter! I’ve added fenders lights and a rack and has served me extremely well.