IMHO, it’s best if you can to get the unit in your system on extended loan, to really assess if it is better for you before spending big.

It should also be pretty easy to switch between the 818 and 218 into your DSPs, so you have a fair comparison.

Main: Marantz SR8015 / Polk Audio Reserve R500 / Bang & Olufsen Beolab 4 / Arendal 1961 1V / Oppo 203 / WiiM Pro Plus / Apple TV 4K

Spare: G68ADV, HD621,DSP5000.2 & DSP5000.2 HC. ATC SCM20PSL, C3C. Rotel RMB-1077. Bang & Olufsen Beolab 1 & Beolab 7.1. Kef Q150. Dynaudio Xeo 2.