Personally I'm much more excited for the Naya Create[1]. It has a much lower learning curve and vastly better portability.
https://www.maltron.com/store/p20/Maltron_L90_dual_hand_full...
It looks ugly, but they were the original inventor of contoured keyboards I think.
Part of my dislike might come from the MX Black switches they used at the time, and I gather that alternatives are available now. Another factor is their keycap profile and the placement of the switches, which mean that if your fingers get misaligned, you hit a gap between the keys. This is more irritating than it sounds.
While not a criticism at the time it was built, it's also worth noting that there was (and is, I think) no layout customisation other than a choice between fixed layouts with a couple of switches on the underside of the keyboard. The case is vacuum-formed, which looks and feels cheap compared with modern competitors, and the bottom is glued on which would make repairs difficult (not that mine ceased to work).
I'd also say that the simpler learning curve here is a "faster horse". To reap the significant benefits, one should embrace a different paradigm of typing, with layers and chords.