I have used this app for several weeks. It is very well thought out and one of the most useful apps I have (and I have quite a lot!). A password manager is not the most glamorous app to use, but when you have a good one, like this one, it transforms your use of the internet and the zillions of passwords one has to keep track of.

The one feature that I find most useful in it:
The ability to store multiple sets of log-in names and passwords for the same site.

This is a HUGE feature. For instance, I manage two businesses that have accounts at the same banks and credit card companies. I can now easily log-in under the correct business with just a click, or keypress. I also don't have to remember the log-in names and passwords, 1Passwd does that for me. Because of this one feature I have now set up online banking access to many accounts that I was inadvertantly avoiding due to the whole hassle of managing all those passwords. Also, I changed all my OK passwords, to really good cryptic, secure ones, because I don't have to type these in, or even remember them. So, not only is my access faster, but it is more secure.

I do not have the time to go into more detail about this app, but suffice it to say, it is very well implemented and easily beats the built-in OS X keychain in it's usefulness. If you do any amount of online banking or shopping, this will make your life much easier.

Note: Expect a slight learning curve and set-up time to get things running the way you want, but it's worth it. Also, only 4 stars as a few features are just not there yet: namely ways to get the data out of 1Passwd. It has a growing number of export options, but lacks even a rudimentary ability to print. The developers are very responsive though, and I know improvements to this are coming soon. When it gets there, 5 stars from me.