Actually, I was the person that started the thread a few weeks ago. And I was the one that raised doubts about the credibility of peoples' opinions. And I don't really care if you believe me. It's amazing how apathetic the compassionate field of medicine makes you.
Either way, I know everyone on here has scores that reach skyscraping heights. But, I don't. I took NBME Form 1 & 2 - I've only made about a 30 point increase to get to passing. So, I've got a lot more work ahead of me.
I've been through all of Qbank. And I've read the explanations. Random blocks on Qbank - I'm in the 70s. It fluctuates - and I don't know how much of this is because I remember the answers. The questions seem to be based on a lot of buzz words.
USMLE World - I'm in the 50s in tutor mode. I've only started using this in the past few weeks. The questions are quite involved, but the explanations are very good.
USMLERx - it's helped me integrate First Aid. I spent about a month, maybe more, just trying to memorize First Aid. And now it feels like a waste of time because rote memorization doesn't help. I got USMLERx about a week or 2 back. The question bank helps put things together. It's not challenging, but it helps if you're like me and can't memorize worth sshhh. I'm in the high 60s and 70s in this.
I don't know if that gives people a bit more info about these sources. Either way, it's just my opinion.