I completed a $1.50, 15 minute survey for C Lab. I have hundreds of completed HIT's and my work has always been accepted. I take my time despite this causing me to average less than $6 per hour. I have never failed an attention check and always do my best to provide valuable information and complete, competent answers. After spending 15 minutes completing the C Lab survey, which was long and required a lot of typing, they rejected my work saying it didn't meet their standards. With hundreds of approved HIT'S from dozens of different requestors this was my first rejection. So this is just a warning that you may want to avoid C Lab HIT'S if you care about your approval rating and actually getting paid for the work you do.