Regarding COINOS support and issues:

I was trying to swap in large amounts (~Millions sats) and succeeded in swapping in (transferring to WoS LN destination wallet) for a few transactions, then coinos started failing those repeated large transfer attempts. A problem happened where coinos transfer attempt choked, but showed in the history tab that transfer was successful, but funds were never received on destination LN wallet AND balance in coinos was deducted.

HOWEVER - I emailed the support team support@coinos.io and within just a few hours got a response from Adam (founder) apologizing for the inconvenience and manually resetting my balance. No satoshis lost. Good integrity custodial platform.

Additional Coinos swapout bug - when doing swap outs, if you click the "Gear" icon to adjust mining fee, and scroll the fee bar all the way down and release, if you then try to scroll the fee bar back up to "just see" what the higher fees are, when you release mouse button the swap-out immediately confirms at that fee rate. It's a bug, haven't bothered to tell coinos yet. If you want cheapest mining fee set it low then don't fuck with it just send the tx.

TL;DR - coinos a little buggy but has excellent customer email support for any issues and has really high integrity. Thought I lost funds in an attempted transfer failed, but funds were restored by support same day. Coinos struggles with large repeated swapins. Swapouts are easy.