Ive never been a menthol fan myself.
But I like the cooling effect type menthols like a Koolada or vapor Ice. No real menthol flavor to it, just a cooling effect. Great as a mixer.
At any count, I've seen many experiement with Menthol as a mixer. Apple+ Menthol or Watermelon+Menthol Ive heard many say is really good. Never tried either myself, as Im not a fan.
But, Bannana + Menthol leads to an interesting mix. Probably wont try it again though LOL.
As with any flavor, some are great and some bad. And it varies from Vendor to vendor.
For example, in a Volcano ejuice you may try Something like Blueberry and its not so good (Just an example) Yet someone like Victory may have a Blueberry thats amazing.
Oh and one thing that may be useful , STEEPING !!!!
Basically if you get a juice thats a bit harsh or not really tasting like it should, you may need to steep it a while.
All this really means is let it sit in a cool dark place for a few days to a couple weeks. Sometimes the juice is so fresh it hasn't had time to properly set up.
It does help the flavors mature.
A good idea is let it sit 24 hrs. Then, shake well - take the cap off - let it sit another 12-24 hrs uncovered. Shake well and try again.
If you have to let it steep a wekk or so and its still bad, its just a bad juice. Nothing will really help it.
But, it most cases, this helps alot of them that are borderline in a couple days.