Grace Hill is a reliable company...I've never had any issues with them and have, several times, done enough of their shops to get a 1099...... Be sure to read the evaluation forms before you make your visits as they have a different feel then the EPMS shops..... Overall, the evaluations are about 2/3 the length of what you need for EPMS..... They pay very reliably, but on a little slower schedule than most MSC's - about 2 months.
I don't hesitate to work for them when compensation matches my needs.
Hard work builds character and homework is good for your soul.