Up until recently i had the Tremol-No on my JTV-69 -
(I explain it here)
However I'm playing the JTV-69 more in a band situation and in my case - i found the Tremol-no just did not hold up - and was way too fiddly - missing set screws and actually falling right off the guitar at a gig once.
So I removed it - and now rely on a SuperVee Maglok on my JTV-69 - WHICH I LOVE!!