I'm shopping around for 10 panel in vivo SPF tests and most companies charge similar amounts, $255 - 290 per subject. It's very hard to know which one to pick, and since it's a significant investment It'd be nice to pick a good one the first time around. So:
1. Which labs are the most punctual?
2. Have the most accurate SPF scores?
3. Have the best customer service?
Here's a list of US labs I've found, let me know if it's missing any and your experience with them. So far I haven't found any suitable labs abroad.