Best printing service?

[AtomicZagnut]

So, I just started printing posters of my fractal artwork.  I got the first batch done by http://uprinting.com.  They arrived today and looked exquisite, despite me accidentally leaving the resolution at 100dpi when I created the file. 

Though I will likely stick with uPrinting for the time being, I was wondering if anyone else had stories to share about their experiences with print services.  Who's the best?  Who should we avoid?

[lkmitch]

I've had good luck with ezprints.com and with fineartamerica.com.  The latter is particularly good if you're looking to sell any prints online.