I want to comment on these boots because they are discussed in the Ask the Boot guys forum as the only real option for small footed women, but I cannot reply there because I am not a boot guy. I have spent many hours with bootfitters (some are on the boot forum) talking about my options, trying different boots, different liners, fitting my too big boots the best we could, etc.
I have always been skiing in a size 22 that was a bit too big and was able to get these tecnica boots last year. I was so excited to finally have the right size ski boot for the first time ever, but was very disappointed when I got these onto snow.
Background on me: approx 130 lb, 5'4", ski 20+ days per year, enjoy blacks when conditions are good struggle on blacks in difficult snow conditions.
Simple put, these boots are too soft and too short on the calf for someone of my size. They resemble more of a junior boot than a small adult boot. I had bootfitter (from a different retailer) look at the tecnica 21 after I had skied them for a few runs and immediately said I should not be skiing in them (and probably should not have been sold them in the first place). The short cuff and soft flex combo does not allow you to properly transfer power from your legs to the ski; you are essentially skiing from your ankles. I was a better skier in a slightly too big size 22 than the Inferno 90 size 21.
If you are noticeably smaller than me or very beginner, this boot may work for you. But if you can relate to my size and skiing, then avoid these boots. A larger size 22 with carefully placed foam supports will allow you to be a better skier than a short and soft boot.
I have skied many ski boots over the years in my attempt to find the best boot for me. My Soloman 7.0 xwave of years ago were even stiffer (and yes, skiing a boot that is too big does affect the feel of the flex compared to wearing the proper size boot). I've also skied Atomic MJay and most recently the Lange SC 120 (softened by boot fitter). For a size 22, the lange was certainly the smallest fit.
I was lucky enough to find an older Tecnica inferno 110 in a size 21. these boots have a higher cuff and are much, much stiffer than the inferno 90. They are the right boot for me and have improved my skiing noticeably.
Hopefully some of the rumors of more size 21 options for 2013 will come true so we have more choices. Until then ladies, keep bothering your ski stores to bother the reps to get companies to make boots that fit us.