A lot more than just a trickle charger as it optimises the battery allowing the correct amount of current required to charge the battery. I had a trickle charger before this that still works, however this was actually recomended to me from several places, including forums and even motorcycle training school (it has been purchased for my BMW F800).
I have had it plugged on constant and plan to keep it that way in these cold winter months just to keep my battery going and seems to be doing what it is supposed to.
I purchased this a long with the "SAE79 Optimate 12V Din Male Plug Socket Lead" and its simple and easy to use.
Also, instructions are available as a PDF, which is handy just to keep on my Smart Phone for when I need a quick reference guide as I have my phone on me all the time.