If your considering Paxum as a replacement for your funding source, you need to be aware of the fees. I found them hard to find on their site, but it appears there is a $5 USD fee for transfers to and from your bank account via ACH.
There is also a $1.00 fee to transfer funds from Paxum to Paxum account.

So, what this means to us miners is this:
You sell your BTC on your exchange for USD. Then when you transfer your USD to Paxum from the exchange, you will incur a $1.00 charge.
Then, when you want to transfer your USD to your bank account, it will costs you $5.00!!!!

So, you will need to figure that it will now costs you $6.00 in fees when you sell your BTC and then get that money to your bank account.  With Dwolla, the total charges only equated to $.50

On top of these super high fees, you will be forced to provide photocopies of your personal information to Paxum in order to comply with their TOS.  You have to send in a photocopy of your ID (passport or drivers license) and then to prove your address, you need to send them a photocopy of a utility bill.  I DO NOT like doing this with any web base company! Hell, I dont even like giving this kind of personal information to my own brick and mortar bank!

If you plan on using Bitcoins as a secure and private currency, I highly recomment NOT using Paxum as a funding source to buy or sell Bitcoins.