I had some of this at work. It might be because I had to work a 6.5 hour day with no break and was able to take a 10 to eat something, so anything would taste good, but I didn’t find this to be too bad. It just kinda taste like Lipton tea with a lemony after taste; thought that is probably the citric acid use to preserve it.
Basically I wouldn’t always reach for it or want it at all. However if you want just a plain brisk unsweetened tea, it’s not bad. At least it wasn’t super astringent.