I did a bit more of research to understand who I need to trust with my L2 balance. The L2 transfers are instand. Every 10 minutes the transactions are getting combined into one L1 transaction. You can actually see these L1 transactions in the testnet. Once the L2 transaction is finalized there seems to be no additional risk. I like that.
2 issues remaining.
On mainnet we can’t pay the withdraw fee with STORJ tokens. Someone has to enable that feature.
The first approval has an unlimited amount. There is an open issue for that: https://github.com/matter-labs/zksync/issues/265 This is more an issue for storj labs and not so much for the storage node side.