I’ve actually had this several times the past two days, just been too busy to log it properly!
I dislike plain mate, so I blend it with Earl Grey usually. I’m out of my proper Earl Grey Creme that I prefer, so I’m using a blend that Teavana recommended, their regular Earl Grey with their Vanilla Honeybush. It’s not as good, but it makes a decent cup of caffeinated tea. I think I prefer the roasted with this black tea, though.
Mate isn’t really what I look for when I drink it, but I find that it’s good to blend with other strongly-flavored teas and then it doesn’t hurt it at all. I have a strawberry lemonade herbal tea that goes much better with this green mate than the green mate does with this Earl Grey. I think the green would probably match up well with an oolong tea—I’ll have to try that next time. Just make sure you use hot (nearly boiling) water so you can extract the most caffeine!