As an experiment on my first batch I did mostly glass bottles that I had managed to scrounge from friends recycling bins, but also did 2 x 2 litre PET bottles (I bought tesco value bottled water for the brew) and a couple of 500ml coke plastic bottles.
When bottled I kept the plastic (along with the couple of clear glass bottles I had) bottles in a large bucket under a thick towel to protect from the light.
Results? At initial opening I didn't notice any difference in quality from plastic, and as the brew was ready for a lads weekend away it made for easy quick pouring. I also used the small bottles for testing whilst it was conditioning (couldn't resist!).
Now? The glass bottled brew is aging nicely, very pleased with it. The plastic bottles got drunk so can't compare over time!