I also have a pair of subs with my 1.7s, and I can play pretty much any type of music successfully. Not only do they do classic rock well, they also do big band and large scale orchestral works very well. Brass sounds astonishingly real with the 1.7s, and I also have some recordings that sound best w/o subs (e.g., small jazz ensembles) but a lot more that sound great with them. Speaking of small jazz ensembles, Ray Brown and Charlie Haden great through 1.7s without help from subs. They really flesh out the sound of plucked upright acoustic bass.
To SunnyJim: read both pages of the review; it may help expand your perspective on the virtues and challenges of the .7. I figure the 1.7 is similar but able to sound bigger (because it is bigger).
Speaking of ... one thing that Maggie reviewers consistently call out is how well Maggies do piano. This makes perfect sense to me because the radiating area of a Maggie (esp. the 3.7 and 20.7) nominally approaches the vibrating area of a piano soundboard, certainly more than you get from a 6" mid/woofer and 1" dome tweeter.