I summarized it in another thread, but the improvements are pretty good. The case is much more stable and lacks the flex of the previous model, and the silenced switches are much quieter than previous silenced ones, likely due to the case materials. There’s no clacking from the space bars or any of the long keys which is a blessing, and they even fixed the wonky keycap printing on certain keys. There’s not really a good reason to just buy a new one all out if you already have an R1 but it’s a superior product functionally and (I believe) priced same or cheaper than before. I have the limited edition 87u as my daily driver and have to say I enjoy it much more than I ever liked my Type-S or original 660C.