What parameters should I consider when choosing an after-market replacement for an original SSD in Macbook Air 13" mid-2011 A1369?

Looks like there are third-party adapters available now (eg QNine). What aspects should I consider in deciding whether the adapter will be compatible to:

Is "proprietary connector / firmware" still an issue today for SSDs on 2011 Air, which can be a stopper here?

Are the following parameters conclusive on understanding compatibility between the adapter and the SSD itself: form factor (M.2 2280), interface (SATA B-key)?

My initial research gives varying opinions:

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