I had Maggie 1.6s in my main system for about 7 years until I replaced them with Salk HT-3s about a month ago. I also listen to a lot of jazz, and I can tell you that the Salks will reveal details in your recordings that will amaze and delight you.
Compared to the Maggies, the deep bass the Salks produce is by far the most immediate and most obvious change - some favorite recordings of mine in which I though an acoustic bass was badly under-mixed were revealed to have substantial bass; I'd just never heard it. Some bass players tend to play in the upper registers of the bass, and with such recordings, you don't miss as much with the Maggies; but other bassists tend stay in the lower registers of the instrument, and with certain recordings the Salks reveal information I never knew existed, not too mention the sheer visceral impact of powerful, deep, but clean bass. The Salks' ability to deep also adds substantial weight to the reproduction of drums.
Besides the outstanding low bass reproduction, other favorite recordings that had a bit of glare in the reproduction of certain instruments (most often with piano and cymbals) are now completley devoid of glare, harshness or any other listening fatigue-inducing qualiities.
While I never thought I'd purchase a speaker without first hearing it, I did with the Salks, and can't be more pleased.