I haven't ridden the Level 4, but I have ridden with Level 3 (Lashed, Broport) and Level 5 (Ultralight). The Ultralights are amazing, but very pricy (I got a great deal but was still leaning toward them anyway). I loved my Lasheds, which is why I moved from Northwave to 32. All are Intuition liners, so you can't really go too far wrong. If you're really unsure, start out with the best value (which appears to be the Level 3) and see how you like the fit. In a women's fit, the boot seem wider thru the toes than most which is perfect for me. Not sure about the men's fit. Definitely have them molded...they're ok without it, but it does make a huge differene. I've taken mine into local ski shops and used their "blower" to heat them up (abut 14 minutes will do it). Most will do it free of charge.