Quoted from AlexF:

I've used Gary in the past and they were fine. I had some alignment issues with one (Lucky Hand) and some missing detail on one (Klondike). There's no way I could wait for months and months for a BGResto without communication as seems to happen frequently.
BGResto and Gary are certainly better than nothing. They both have some issues which would be easier to accept with if they were considerably cheaper than a silkscreened glass. I'd much prefer a Shay or Ron Webb true silkscreen for $50 more given the option.

Quoted from AlexF:

I've been curious about them? Seems like I read the quality is good. Wondering how hard it is to apply the decal without fudging it up? And the cost?

Quoted from Vintage-Pinball:

I've made several glasses from their products and can attest to their being of good quality. As said pinhead52 you need to use the water-slide technique though all I'd add, from experience, is that another pair of hands make the process easier for alignment, etc.
Also, as the 'glass' is rolled up inside a tube for postage, take it out and leave it open, curled-side down and weigh each corner down and leave for a few hours so it loses its will to roll itself up again. You'll also need a scalpel or Kraft knife to trim it and I leave enough to go over the edge of the glass and seal the entire edges with adhesive clear tape, just like BGresto do and that reduces the chance of it lifting away from the glass.