Last year I bought a pair of Technica Altitude that I used on Rainier, Hood & St. Helens. I also bought a pair of strap on rather than step in Grivel G12's even though my boots could have had step ins. Both boots and crampons worked very well. I didn't have to adjust the straps once, just followed the directions. I will use plastic boots when and if I do McKinley, but for the rest, the above worked fine for me. As for buying crampons on eBay, one of my climbing partners did exactly that trying to save a few bucks and ended up reselling them and buying a different pair locally. To me I guess it's a question of how sure do you want to be of your equipment? It is your life on the line!