I don't think there is anything wrong with it. Are there better products, yes. If I was going to keep and clean out my beer line. I might go with some barrier tubing. It's only $1.50 or so per foot. Then again, and yes this is a figure pulled from nowhere, 99% of bars, restaurants, and kegerator owners use vinyl tubing and don't have a problem with the way it tastes. Sure commercial systems use barrier tubing in part but there are still lots of jumper lines, lines going to the faucets, etc. that are vinyl.
I may look into this:
https://www.morebeer.com/products/u...crobial-pvc-free-beer-tubing-316-id-foot.html
But at the same time I feel like it's a solution to a problem I don't currently have. My lines are in a keezer, so they are kept at <40F, and I don't think any wild stuff is growing there. And I don't sense any "plastic" taste in my "food grade" vinyl lines - that's what "food grade" is supposed to be for, right?
I may try a few lines in my 9-tap keezer and see if it makes any difference. A lot of positive reports on morebeer could be "placebo" effect, frankly.