Placing a Bid
Bids can be placed from the item page, from the Item Watch page (if on the buyers watch list), or from the buyers Current Bids page. The buyer simply logs in, enters the maximum amount they are willing to pay, and the system takes care of the rest. The maximum bid will only be reached if the current bid is pushed up by other bidders. The buyer has the peace of mind that they will not ever pay more than their pre-entered maximum bid for an item (though they can increase the maximum bid at any time).
An email notification is sent to the buyer if and when there maximum bid is exceeded by another bidder.
Buy it Now
Auctions marked with the buy it now logo 
can be purchased immediately, provided no bids have been placed on the item already. Using the buy it now feature means the buyer can secure the item immediately, and pay immediately ensuring faster shipping (instead of having to wait for the auction duration to run down).
Checkout
Both standard wins and buy it now wins are displayed on the buyer checkout page. Wins are grouped by seller. The buyer can make a single payment to each seller to pay for all outstanding wins with that seller. So if a buyer has bought 4 items from one seller, the checkout will add the total of the items, plus tax (if set in seller settings), plus shipping rates (also set in seller settings), plus insurance (if set in seller settings).
The total amount will be passed through to Paypal so that the buyer can transfer the funds instantly to the sellers Paypal account. Upon returning to the auction site, the recently paid for wins will be marked as Paid, awaiting shipment, to reflect their new paid status.