i am a big fan of fritz and his speakers... they are terrific in absolute terms and excellent values to boot
that said, being smallish standmounts, they are physically limited in terms of bass response, as mostly all are... it is simply physics
some, in smallish listening environments may feel satisfied with the lower range of these fine speakers, that is terrific... our listening satisfaction is a function of our prior points of reference and our expectations
but to be blunt, to add a good sub (and ideally two) well integrated into the system brings the sonic presentation to another whole level to realism, palpability and impact (i say this with no exaggeration)
whether it is worth the cost and the trouble, depends entirely on the specific listener, but there is no doubt the positive return is there and aplenty

