- model exists and is already provisionally agreed
- obviates multiple transitions of EU-UK relations
- least disruption to Irish border
- effectively membership, but w/o legitimacy of taking part in voting
- dodgy legal basis
- runs into budget issues past 2020
- clearer move away from membership
- maintains SM links, so avoiding need for that part of backstop
- more opportunity to be firm about time-ltd-ness
- No text to do this exists, and requires agt of non-EU states
- EEA & EFTA members cool on idea of disruption of their set-up
- won't cover all aspects currently in backstop, so doesn't fully avoid it