Overall my experience with Gamepal was positive. The gold in which I ordered was not the cheapest of all the sites, but it was guaranteed in-stock by their customer support. Their customer support wasn't a native English speaker but I could understand what they were saying through their broken grammar.
It's hard to describe Gamepal as a company, they've been around for awhile and overall they are a fairly reliable company. They've had a few problems in the past with account trading but it looks like they don't do that anymore anyway.
If your looking for the cheapest gold sellers.. 9 times out of 10 this isn't the website for you. But if your looking for a reliable company then look no furthur. It took them 20 minutes for the first 100 gold and another 3 hours to send the other 100.. which is longer than I'm used to waiting, and it had it to be made in two payments since they couldn't send it all from 1 character.