3 points ·
I had the 64GB model, and I upgraded it to a 1TB SSD.
It is miles better; mostly because some things don't get installed in the microSD card (shader cache, proton versions...), so I barely had any space left in the internal storage, even though I had 512GB on the SD card.
I didn't clone the previous install, I just did a new install from scratch, but it was painless and very fast with a USB-C pendrive by following the official instructions. I had to redownload some games but it wasn't an issue with gigabit internet.
The performance is similar for most games if you have a quality SD card, but if a game does heavy loading you may notice a difference.