I've probably posted this a thousand times. My apologies to those who are tired of the reptition.
I use T-2's and Sabretooth crampons. I've climbed everything from mixed snow and rock to WI3 in them with no problems whatsoever that I could attribute specifically to the boots or crampons. That is, any problems was due to poor technique. Obviously, any plastic boot is going to suck for technical rock climbing but for climbs where I am approaching with skis I will always use tele boots and sabretooths. I'm not experienced with AT gear so will defer to others for that input.
Furthermore, I have had partners who had problems with their crampons popping off at inopportune times. I've never once had my sabretooths pop off. The sabretooths are fitted with an extra notch so you can extend the frontpoints out to accomodate the duckbill on the tele boots.
Like any other potential boot purchase, make sure you mate your crampons to your boots before purchasing to make sure they are compatible.
Hope this helps.