I am not sure what rnos shocks are but one can assume that maybe you are implying they are NORS (New Old Replacement Stock) ...which really would not "replacement stock" but more like 'reproduction'. Since I am at a disadvantage by not being able to identify your shocks, one can only assume they are similar to the cheap reproduction shocks sold by many of the major parts vendors. Experience by myself and many others have shown that using them has proven they are very poorly constructed and generally become ineffective (--or locked-up) after a short time of usage. Therefore they fit into my category of poor quality reporduction parts.
The 2nd parts of your statement which may be true for you however I have not found the case for me is the comment regarding " ...shocks are plentiful in good usable condition." I have the specialty tools necessary to disassemble shocks, and most shocks I have found are worn to a condition where it is not cost effective to restore them internally back to a condition where they perform as they were originally intended. Yes, I agree there are Rebuilders out there who claim they can refurbish a shock however when you compare theirs to the action of an unused NOS or newly manufactured Stipe shock, you realize they come up short in matching performance. Again, this is another one of those things where first-hand experiences are necessary to make an unbiased comparison. With regard to why I used the MG shocks, ...the Stipe shock was unavailable at that time and I was looking for a performance level above worn original shocks that had been "rebuilt".