The model I tried out is the explorer deluxe asym.
I have a HH and the velcro slit is not a comfort issue for me. I sleep on the diagonal with my head to the left and feet to the right. I lay half on my back/half on my side. Sometimes I'll bring my right leg up in a figure 4 in front of the slit. It is just there and I found a way to get comfortable around it because it's way better than sleeping on the ground.