I agree that the taste can change quite a bit, but I don't mind variety. I like the fact that you can keep refilling your cup, I usually add sweet tea leaves to my yerba mate for taste.
For me it's not a hussle, rather it works really well. I find it to be very stimulating, much for so than a typical energy drink, and in a much more natural way. But I try not to drink it regularly and only for certain occasions, when I really need to be alert, and well stimulated( a clean tweak if you will, lol) perhaps for day long drives, or an intense study session.