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I have read a couple of other posts that indicated some problems with misaligned grids in SuperSpacer-equipped glass packages.

I recently had 14 double-hung windows replaced, 5 with grids. Glass by Guardian.

Out of the 10 sashes, 5 had grids that were out of true by 1/8" or more. In other words, half of them went back. The next batch was inspected by the owner of the window company that did my installation. (Direct employees did the install. The job foreman is Installation Masters Certified). The owner sent the sashes back, all with alignment problems. He involved his mfr rep and the rep's VP.

This third batch was supposed to be QC-monitored before it left the glass company, and certainly before the glass packages were installed in the vinyl sashes. Of this group of 5 sashes, we had to send 3 back: One for being the wrong size--inches too big for the opening, and 2 for alignment problems 1/8" and 1/16" (but on a short horizontal span, it looked like an arch).

The owner of the window company has been very accommodating and helpful, with regular follow-ups and multiple conversations with the mfr rep. He has handled it extremely professionally, making sure that (a) the grids that get installed are within the 1/16" tolerances that Guardian says they maintain, and (b) that I am 100% satisfied. This is a perfect example of what you advise about installer selection: Pay attention to reputation and service after the sale. I did, and am very glad for it. The owner of this company is outstanding in both regards.

What is your take? I believe it is reasonable not to see arches and un-parallel grids. When does it become unreasonable to continue insisting on good alignment? Some of my other sashes have minor visible problems, but they're within the Guardian spec, so I'm good with it. The replacement window mfr gets mentioned frequently as one of the top 5. Again, your advice has been invaluable: Good company, good warranty.

Thanks!

I don't see anything unreasonable about your concerns. This type of situation really does highlight the value of going with a reputable company. I'm sure they will work hard to satisfy you.

I agree with Sky .
Hope you will report back when resolved and tell us the mfg and the contractor.