It was $69.00 shipped for me and, from my experience, it performs significantly better over the older 5341G.
Furthermore, this is not really a comparison of a Zoom modem vs a Zoom modem. This is a comparison of the original DOCSIS chipset made by Texas Instruments and the newer chipset made by Broadcom.
Lastly, having 8 bonded downstream channels helps with congestion during the more demanding periods throughout the day.