I recently bought a Legion Go S because the primary way I game nowadays is streaming from my desktop to a handheld, and the higher quality display (1900x1200 resolution with 120 Hz over the 1280x800 and 90 Hz on the Steam Deck OLED) seemed worthwhile given that my desktop can easily provide enough throughput to play with relatively high graphics settings. It came with SteamOS preinstalled, and from a software perspective, everything does seem pretty close to identical. The only things I've slightly missed from the Steam Deck are slight hardware nits with the Legion Go S; the placement of the equivalent of the two SteamOS-specific buttons (not sure exactly how to refer to them, but they're labeled "Steam" and "..." on the Deck) just above the Start and Select buttons while looking and feeling the same mixes me up sometimes in a way that never happened on the Deck, and I miss having four unmapped buttons on the back of the device that I can set up however I like in games rather than only two. I also tend to prefer having symmetrical thumbsticks higher up on the device rather than having one high and one low; I've noticed that my hands aren't quite as comfortable when using the D-pad for extended amounts of time, which is unfortunate given my preference for it when playing stuff like emulated GBA games (incidentally one of the few things I tend to do locally instead of streaming; the low power profile setting already is an easy battery life win when streaming, and in practice it make the battery life when GBA emulation also much more tolerable, along with keeping the fans much quieter without seeming to impact performance of the emulation, given that even with this setting the fast-forward function can go far faster than I'd ever need it to).