Hi,
Maybe it's just me, but I find the "Add Word Frequency" to not work as it should. I set the option to "slow", thinking it will add words to the review queue AFTER I clear the items in my review queue, but then I get 12 words added to the queue. THEN before I can complete those words, it adds several more! I hate that I have to manually add the words to my queue to control the pace. I wouldn't be as annoyed if: 1) I weren't paying for the service, or 2) They didn't even have "automatic adding" as an option.
If somebody out there can explain what I may be doing wrong, then please do. I like Skritter, but I think that basic functions should work, especially if I have to pay a monthly fee.