I tend to find BGResto glasses a bit fuzzy around the edges of the artwork and not as crisp and clear as screened glasses. The backs are masked, but here again, I find BGResto glasses to be not as translucent making them a bit darker when lit than the originals.
With that said, you're only going to really notice the differences if you have a reproduction next to an original. If you don't have anything to compare it to, I'm sure you'll be pleased.
The biggest issue is communication and the looong wait. I'd suspect 97% of people that have ordered a BGResto glass post on here asking if they're still in business. You're not going to get any updates on anything. But 6-8 months later when you've given up hope...the package arrives.