I've been using my Redcard for a few weeks to hit my minimum spend on some reward cards and using the online bill pay to pay down my student loans. Works great so far.
FWIW I have been loading $1,000 per transaction and doing 2 transactions at the same time. So loading $2,000 per trip to Target and I have loaded more than $6,000 in less than 1 month.
MilesdividendMD, I am not sure where you are seeing the limit of $5,000 per month but I have not had an issue with loading more and did not see that limit anywhere on the website or in my agreement.