After my recent experience with juices in plastic gone bad (his hasn't happened with all my plastic bottles, so I am guessing some vendors use better quality plastics than others) I will actually be swayed toward vendors who sell in glass bottles. I won't keep a juice in plastic for longer than 2 months in future which means I most likely will need to transfer the juices into glass, which is a factor that will matter in future orders.
An additional observation I've made is that squishy plastic bottles seem to be worse then harder plastic bottles in terms of juice preservation.
Yes squishy bottles are much worse. juice starts to taste like plastic. I have not had much problems with TPR's plastic or SDV. I think they steep faster but they do not taste bad. Or maybe I just finishthem faster? I had some Bryce's that turned black in a few months and smelled horrible.
I have had just the opposite experience. I find that my TPR eliquids turn very dark. Also same with certain flavors from AHL especially with some of the flavors ending in "cream".