I have had a Paypal debit card since the first started offering them. Can't beat it.
The best feature is that if you don't have enough of a balance in Paypal to pay for your purchase - if you have linked it to your checking /savings account with your bank they will pull from that account to cover the purchase. This process usually takes 24-48 hrs, occasionally it is immediate.
I found out this week (once again) one of the reasons I really like having this card because my debit card number was stolen (this has happened a couple of times in the past - figured out those two times that it was an untrustworthy supplier for my retail biz). The big benefit here is that this card creates an extra layer between my bank account and the perpetrator/s.
Paypal also usually keeps a close watch on fraudulent charges and will take action.
I noticed an email notification that my "back up limit was approaching it's limit (you can choose a dollar amount limit on how much can be deducted from your bank account in any given period - definitely a good feature). I knew my back up limit was in the thousands so that was a big red flag since my recent purchases had all been small.
I contacted Paypal immediately. Within the previous 12hrs or so there were 7 fraudulent transactions and apparently the very first of these had already been denied by Paypal and a case opened - so they were allready on the alert by the time I caught wind of it. They took care of everything - even though I still needed to alert my bank as some of the ACH transactions would be fairly automatic and would need to be refused/returned by the bank.
Please note that the Paypal Debit card is part of a "business account" with Paypal. Most of the payments you receive through this Paypal account you hormally will be charged a commission (fee). Fortunately most MS companies have some kind of arrangement where either they are paying the fee or it is figured differently so there is no charge. If you receive payments from other sources you will be charged about a 3% fee.