That's been my experience too.
Those early ones (the Monks, Herbie Nichols, Brownie etc.) are usually immaculate. I had to request a replacement LP on the Miles Blackhawk set but of course the great people at Mosaic sent a replacement out pronto. I think that's the only time I've ever had a flawed LP from Mosaic, a fantastic QA performance from them.
Yep, they have a great customer service.
On the Davis's sets I found minor flaws, small ticks usually, nothing serious enough to push me to ask for a replacemet. For instance the Nichols is absolutely perfect after a cleaning cycle. And, despite 'digital transfers' from Ron McMaster, it sounds very good.