Chalk me up as an Anki user. I couldn't have done as well as I have in my college español class without it. I felt like I had superpowers when I knew vocabulary that some of the native speakers struggled with.
The thing I like most about Anki is that it can show you nice little graphs of your progress. No matter whether that line is curving upwards or downwards, it helps a great deal to motivate myself for regular study.