'Had shrinking issues (major) with Avery few years ago. 'Took like 8 months but I finally received a full credit for the price of client's invoice but as they gave it to my distibutor, I have had the choice to buy 3M material instead of Avery... they never knew that.
'Had in printing issue (fish eyes everywhere) on a roll of 30" Oracal 5600 reflective. They replaced it and the new roll performed exactly as the defective one. They sent me 2 full rolls of 3551GRA 54" to apologise and suggested to buy another brand of reflective from my supplier byt the time they found out what was the problem with this batch. 'Had another problem with their 3751GRA as it hit the market. 'Got great support again from our Canadian representative Kevin Crawford (Oracal). Never had a problem with cast material from Oracal (3951) or 3M (IJ180) since I started printing with my Roland in 2004. However, I don't like working with 3M laminates so whatever the vinyl I use, they are always laminated with Oracal 210G or 290G.
I don't like gambling so OraGuard (Oracal) is the way to go here at my shop. I use a lot of 3M in my colored cast films for computer-cut letters & graphics, also lots of Oracal and some KPMF and Avery for specific colors.
Nothing's perfect, **** may happen but it's the way a manufacturer back-up their lines of products when problems arise that set 'em apart, or not. Usually your supplier's sale rep is supposed to step-up at the plate for you and find a solution.