The Neo 2T offers some side to side movement out of the box but the motion plates offer front to back movement. The plates give the Neo a more natural movement and I really like that but when you see what they are and what they are made of you have to wonder "why so expensive". And that is where Garmin has got you if you want more natural motion. They are on par or cheaper than most rocker plates and I think they perform just as well, look better, and take up less space but you will ask yourself why do they cost so much? You can find instructions on the internet for building your own at a fraction of the price but these look like they are just an extension of the Neo itself. Bottom line is they function well and look great but cost way too much for what they are. If you want motion suck it up and buy them. They are custom made for the Neo and are in the ballpark of the price for other rocker plates that do the same thing.
Never heard of these until the morning they were released for sale last week, a spur of the moment purchase that actually shipped that night even though they were noted as backordered, I received mine today. During my inaugural ride on Zwift tonight after a remarkably easy installation I found that the inch of fore / aft free float movement radically improved the ride experience. Seems to make the bike "float" in combination with the slight side to side flex built into the Neo, even less feel of being locked in place. More natural. The ride was about 25 miles, I can see where the comfort will help on longer rides. I did not try standing or sprinting, two areas mentioned as being a weakness. Very glad I grabbed a set before they became officially backordered.