I haven't taken step 1 yet but have done a lot of questions including some of the RR questions. If you are talking about the ones with the green and black coloring and you can either choose tutorial or exam mode, then I have done most of them.
I think they are easier than Q-bank and the explainations are a bit more brief but the questions seem to ask very HY points and will probably be worth doing. I think Goljan wrote them and they are based on his views of the most HY Step 1 topics and associations. They are short for the most part and you should be able to whip through them fairly quickly. If you have listened to his 40-hours of audio then they will be really easy and quite familiar.
Hope this helps,
RJ