Thanks for the great question! The Acoustimass 10 and our Soundbar packages vary both in form and function. The Acoustimass 10 system that you will currently have will offer you true surround sound with the functionality from the central soundbar, four surround speakers and bass module which are all included. Our soundbars, however, can be connected to one additional accessory bass module and one pair of accessory surround speakers - providing you with three physical surround speakers which may be an important factor to you.
It's important to also note that the Acoustimass 10 requires a connected amplifier or receiver via bare wires, whereas our Soundbar packages are able to take HDMI and Optical cable inputs directly.
Please do reach out again to the Community if you have any further questions, I'd love to help.