I am not really "experienced", but I've had 2 cards and was doing a lot of research while the cards have become unavailable.
I don't know Bonpay, but let's see, from what they show and what they don't:
* I don't see the card fees - from issuing to monthly/yearly management fee
* I don't see the fees for using the card at ATM (unless it's virtual?)
* I don't see the fees for converting from card currency to national currency
* I don't see the BTC/USD BTC/EUR conversion rates they use
So I can't tell how good the card is, they don't tell enough. Also pre-order means they don't have it yet.
For now I know only of one card provider that may worth working with for a normal user, all the others have issues (most have no cards available now) or too big fees.