Hi James,
My name is Chad Dixon. For three years I was a production manager for Nesika. This is what I can share with you regarding these actions.
In Poulsbo Nesika was using an older Okuma machining center to produce receivers under the guidance of a very, very talented machinist named "Nick". That combination worked well but was a bit lethargic as it was an older machine. In Sturgis the actions are/were made on state of the art Kitamura machines. Nick left during the late 04/early05 timeframe and production of receivers was turned over to another individual. There was a learning curve during the transition as the # of employees increased considerably as did the volume of production. Many mistakes were made consequently.
During the "dark times" (05-07) there were some actions that made it out to the public that never should have. They were made from a different material. I believe most/all were returned and the problem was corrected. I doubt seriously the action you are interested in has this problem as the numbers made were quite low.
As for quality. In some ways Nesika outshines others and in other ways they leave a bit to be desired. Galling of the bolt lugs has historically been the Achilles heel. One has to always remember that they are tight tolerance actions and if they ever come out of the proper set up they are very likely to chew themselves to bits. The bolts are chromoly and the receivers are 15-5ph SS. One needs to understand this early on and ensure the action stays sterile. They typically don't fare well in abrasive/dusty environments.
I own my own shop now and service Nesika actions on a regular basis. If you decide to purchase a used one and want it looked over I'd be happy to help you. There's no "rocket science" to these things, but there are certain features that need to be paid attention to when servicing/setting them up. A smith who isn't familiar with them can inadvertently mess them up if following the more conventional "smithing" doctrine.
By and large I think they are a good product. Are they as good/bad as others produced? It's a highly debated topic and 99.9% of it is based more on opinion/emotion than anything else. For the most part the bullet has no idea/nor cares what name is on an action when the striker nails it in the arse and lights the boiler.
Good luck.
Chad
Chad Dixon
LongRifles, Inc
Sturgis SD