After a few weeks of having it available in the studio, I am finally getting around to seriously learning the MODX6+. The workflow is not as straightforward as my old Motif ES6, but it is manageable. The AWM2 and FM-X sound capabilities are more than suitable for the R&B stuff I am presently working on and provides enough variation from my other modern workstations, a Akai MPC Key 61 and Roland Fantom-06.
The 3 synth card expansion slots of the Motif ES series are missed, which I installed a PLG150-DX and two PLG150-ANs. An AN1x analog modeling engine would be a welcomed addition to the MODX+ series. On the plus side, no complaints about the FM capabilities. The MODX+'s FM-X engine exceeds that of the old PLG150-DX expansion card.
The key bed and build quality are not great, but I am mostly using the MODX6+ as a sound module. Therefore, not a major problem for my use case.