Like I said, this is my second mat using this method, and I'm pretty happy. You really only notice the pixelation if you're looking for it, and to be honest when you're engaged in a game you usually aren't staring at the mat--it's background. This fits the bill, I think.
The other nice thing about this is that it is unique. There aren't a whole lot of options out there right now for 4'x6' space gaming mats (although there seem to be a ton in 3'x3', thanks no doubt to the popularity of X-Wing and Star Trek: Attack Wing). The Frontline Gaming mats are very nice, to be sure, but they only have one pattern for space mats. Unless someone else has used this exact same image to make a gaming mat, you likely won't see another mat like this.