I haven't heard of them before. Looking at their site, it looks pretty interesting and comprehensive.
One concern I'd have though if having the records online is if they would then decide to switch over from free to non-free. Then would the service justify the fee or is it easier just to keep own records.
As for my current records (HSA account), they consist of manually filing bills and receipts and insurance payment breakdown (from BCBS) in folders. Namely, two folders. One for bills currently paid with own expenese and another bills reimbursed via my HSA.
Plus, I created a spreadsheet of my own, to log each event for easy reference.
Have you ever seen a headstone with these words
"If only I had spent more time at work" ... from "Busy Man" sung by Billy Ray Cyrus