I spent a little extra on these compared to basic BD I was looking at, I used them on one mixed climb and they performed flawlessly on ice, snow, slush and rock. I wear mens 11 Asolo mid weight hikers and they fit perfectly at the longest setting hole, any larger and you better consider an extended bar. The balling plates worked great (no need for tapping).
I love these so far and would recommend them to any other aspiring novice mediocre alpinist ;)
Update: To fit my plastic double boots, I refitted with Grivel Valter Long Bars. See product / reviews here at BC.
The Air Tech front points well and is wonderful on traverses. Great for general mountaineering and steep trails.
They are a very versatile crampon that with the right boot, can handle short pitches of vertical ice up to WI 3, though there are much better choices for vertical ice, like the G22.
I want to add some info regarding fitting to double boots. I just got a pair of Koflach Arctis Expe. The Air Tech will not fit (size 9UK). The standard bars are ONE HOLE too short. Longer bars are needed for, at least, these boots, and I'd suspect most other doubles.
I gave these to my sister for Christmas and she loves them. The 12 points makes for such a versatile crampon overall. Particularly nice on these is the anti-balling plate feature keeping snow from packing and balling up underneath your feet, making you lose traction and possibly causing a compromising fall. Not to mention that it is always nice to know that you have hot forged steel on your feet to take you that extra mile. Most recently used these to scale a 1,000 foot head wall going up to the Pfeifferhorn with no problems at all. Buy and enjoy!
Good on mixed and vertical ice. Some technical features not seen on other crampons. Good on the down hill with points set to support that. Moderate length on all points so they are very good on mixed. Grivels typically fit most boots better than some other brands. If you want to do a lot of mixed get the Tech....if all you do is ice get the G12.
If you have a larger shoe size than 10US, you will need longer center bars. At the largest setting, they just squeeze onto my Salomon Quest 4D GTX, size 10. I have the new classics.
I've been to two mountains in the Adirondacks with those - some were pretty icy - and these crampons felt secure and rugged so far.
I read all the raving reviews and talked to a gear expert about it as I am a complete novice when it comes to crampons although I've been hiking in the mountains during winter for years. I'm sure for ice climbing, these are great but for me they are cumbersome and take a while to strap on (I got the New Classic as my Lowa Banff won't take the New Matic) - in freezing cold it's a problem and sometimes I don't put them on or take them off because of that. The real "deal breaker" is that they kept getting caught in my snow pants and once I tripped and almost tumbled all the way down - good thing there was plenty of snow to break the fall. :) I read some other reviews about Hillsound Trail Pro and Hillsound Cypress 6 - I'll try the latter first and see if they do the trick (without the front points and with all points 1cm shorter, they may just work for my intended purpose).