So this post will be short. I'm only writing it because I stated previously that I would. See, phoog seems to chime in (or hijack?) many PDI vs Invisiglass threads saying his glass is equal or better and cheaper. I bought a sheet of this glass to compare. See, I have 20 pins. All have PDI or Invisiglass on them. To me, those glasses make the pinball pop and look like there's no glass at all. I ordered a sheet of the 3/16" ultra clear glass from pinballglass.com to compare (phoog's glass). Since I own so much of this glass, I consider myself an expert on the stuff. So how does it compare?
The glass is pretty good. It's definitely an improvement over a brand new sheet of regular glass such as the one that came on my AC/DC premium, that has never been used. But the glass is clouldy when compared to either PDI or Invisiglass. There's a level of clarity on the PDI/Invisiglass that is just not matched anywhere else so far. I think there's a bigger difference between PDI and phoog glass than there is from phoog glass to regular glass.
I am not providing pictures or videos. That's because for this product you just cannot capture the benefits of it in pictures or videos so they're a waste of time. If you're on a budget, I can recommend the phoog glass over regular glass. But really, I'd suggest just holding out until you can afford the real stuff.
There are other threads that discuss this also:
http://pinside.com/pinball/forum/topic/pdi-vs-bobs-ultimate-aka-phoogs-pinball-glass-face-off
And also my original post here which identified that invisiglass vs PDI performed the same:
http://pinside.com/pinball/forum/topic/invisiglass-vs-pdi-glass-comparison
One more comment that I don't think has been addressed in the past. Invisiglass uses a coating process on the glass in order to make it clear. PDI glass embeds this coating into the glass. It may be possible that over time the coating will wear off on the invisiglass. We don't know as the glass has not been out long enough to know. But the likeliness of that happening on the PDI glass is slim.