I buy new $35 sheet of glass for every game that enters my gameroom. The difference between even mildly scratched glass and a fresh sheet is huge. My gameroom has near perfect lighting and black ceilings to minimize reflections, so the difference for PDI is not worth the big bucks. You really have to struggle to tell the difference between the glass on WOZ and the other games in my gameroom especially when they are clean top and bottom. I've seen the PDI comparisons to Invisiglass and PDI is noticeably better. I would probably buy PDI for my nicer games if I could get it at my door for $100 or less per sheet.

These are the way to go. You can set the brightness both during game and attract.

http://www.arcadeupkeep.com/backbox-kits/4587457160

Coded to dim the fluorescent bulb?

Two questions:

Did the Stern glass come with any special handling or cleaning instructions?

Does the Stern glass have a watermark on it to identify it? If so, hopefully it is small and or hidden?

The early reviews have been pretty positive from what I have read. The Stern is at least in the middle of the two if not closer to PDI.

They were purging the glass with the big ugly JJP watermarks that they stupidly put on the original runs.

Yeah I'm surprised there isn't some sort of mark or etching hidden asking the edge.

Yeah it looks like Stern has the right stuff. That is a huge difference. I'd like to see some side-by-side pictures and video with PDI. Looks like Invisiglass is in trouble...

PDI is cheaper in Europe I though.

There is a lot of anecdotal, non scientific and apples to oranges information out there on this subject. Also, a lot of people expecting more than what is actually promised. The best controlled video and photo comparisons side by side that I have seen show that PDI is clearly better than Invisiglass (sorry for the pun). The Stern glass looks similar to invisiglass but the jury is still out.
None of these can fully make up for an improperly lit room, bright speaker LEDs, DMD reflection, bright LEDs behind the translite, etc.

Each game has it's own glare issue as does each game room and even two different spots in the same game room. Judging the difference by eye is very tough. That is why the best test is side by side and not on a pinball machine at all. The video linked in my post above is to me incontrovertible evidence using a very scientific method. They are both in the same environment on the same screen at the same time and all variables such as position or camera auto settings eliminated. I'm not sure how anyone, even an engineer like me, can watch that video and not come to a definite conclusion. Now we just need two more videos exactly like that with Stern vs PDI and Stern vs IG.