It was time for new boots and after three rounds of trying boots that didn't fit (many hours wasted) I found these one. OK, they were a bit more than I had planned to spend, but what a difference. The inside is very welcoming but yet tight and snug all around the foot. The heal-grip is tight. My feet has some bones that were problematic it the other boots I tried (Lange Fluid 100 and 120, various Nordica, Dabellos, Salomon etc) but there was no pain from the beginning in these boots. After they have been headed and fitted - fo'get abo'it!
1st day on the slop - the flex 90 stiffens up nicely, still tights and hard enough for good control when carving. After 4 hours, my feet were still fresh.
$600 is a lot of money but you'll have these boots for 5-10 yrs depending on use, I consider it a totally worthwhile investment and wish I've bought them earlier!