I've been using these replacement blades for over a year now. When I started using them in 2012, they worked well and took weeks to dull. Now, they dull within a couple of days' worth of use. I don't think I've changed the number of times I've been using them in that timeframe. These "titanium" blades don't seem to last longer than the "regular" blades, either.
I have started using the titanium replacement blades because they seem to last longer than the regular blades. They are a tad higher in price initially but since I don't buy them as often, I save money. Shipping is great and the prices more than reasonable.
This is the real thing! I bought one of this a few months ago with other seller and they were imitations, so bad, because they didn't work well. But these are the good ones. Very sharp and long handle, just identical to the one that is in your trimmer.