TLT5 mtn boots are super. Quite good to walk in- amazing flex and buckle up quite tight and very very light. The tongue insert adds extra rigidity but I didnt use them on a recent trip. I would take them for prolonged down hill, like US volcano descents but in AUs with the undulating terrain I dont think its that needed. They also are great with my Grivels and ice climb quite acceptably. I have Dynafit bindings on Madshus annums and skins and the whole set up is amazingly light. You still feel like you want to fall backwards when you first start skiing if you are used to downhill bindings and boots but you get used to it pretty well. HAving the pattern base in Australia is a distinct advantage as you can leave the skins off a lot of the time.