I have 4 barrels from ES with a fifth on the way and I've had zero complaints. I've also bought his AI prefits and again, zero complaints. My next barrel will come from him too.
You do have to be aware that he's a one man shop, so when he says his lead times are 4 to 6 weeks, you're probably looking more at 6 to 8. If you're in a rush, look elsewhere, but be prepared to do an extra $200. For me, I'll keep the 8 pounds jug of powder worth of cash in my pocket and wait patiently for my barrel.