That I understand, usually eth transactions go through in few mins though at max and considering the amounts you're dealing with, I'd prefer the safety of the system over little waiting and a small fee over a surprise like this (global settlement).

This bear market has been a perfect battle test for stablecoins, and Dai has proven itself in the harshest of conditions, as the system came online just before the end of bull market and eth has seen 90% drop in price since, that's why I'm recommending it for anyone wanting to have some and it's also decentralized which is a big plus for many.

But currently you can only use eth as collateral, that will change over time though. The system itself is simple for the end user, you just need to make sure your collateral value stays over 150% of Dai drawn at all times. If it goes lower, the system will automatically take its cut and return the remaining collateral back to you.

There's currently 60 million of Dai in existence but since it's still in beta, it's not on any major exchanges, that'll change in about 4 months.