When the idea first came about, it was a mess. It took a few weeks of emailing back and forth with them to get it right. (I had an account, but it wasn't hooked up to Sentry's payroll account, Bill.com wanted to charge me, etc. etc. etc.) I eventually did get paid for the one shop I made all the fuss for, but haven't taken any with them since.
I haven't NOT shopped them because of this particular issue, it has just worked out that they haven't had anything available since then for me to test the waters again.