Hands down one of the best purchases I've made in regards to lawn care since I started reel mowing. In my opinion if you have a reel mower and cutting less than 1", the landscape bade is a must. When trying to edge around vertical surfaces, the string trimmer beats the heck out of the grass to get it trimmed short enough to match the HOC from your reel mower. Oftentimes, my grass would have a scalped looked to it all the way around my raised boarders, and fence line. The landscape blade cuts the grass as short as you need to match the HOC from the reel and leaves a clean cut that is not scalped.
As far as versatility, I've only pulled my string trimmer out once this year, and it was mainly to do some trimming around my neighbor's lawn. They are an elderly couple, and I cut their grass on a regular basis. I didn't want to use my landscape blade where I did not need to.