Saw some reviews that mentioned "warping" which will happen if ...
346056
Saw some reviews that mentioned "warping" which will happen if you use it on a glass top/electric stove. Also, don't put it in the dishwasher and don't heat over medium/high. That means it takes a bit longer to cook but it works perfectly. The 11" size may be a bit large for gas ranges.
247195
The metal could be sturdier, as it can be bent when heated up fully. This distortion can also happen over time, and I think the metal construction could be more solid to avoid this.
1312476
The book arrived in seemingly good shape but proceeded to warp extensively after opening.  We ordered this in November and it was originally scheduled (by Amazon) to arrive 12-30-14.  It arrived last week so we waited an additional 5 weeks and, while the contents don't disappoint, the cover is really warped.  Have to wonder if the printing was not dry and the book began to curl as it dried in the open air.

This is an $89+ purchase.  My question is, what do I do now?
4268255
Seems good but warps when it gets hot.  Opposing corners raise and the opposite lower when this thing gets hot.  Did not use over 450.  Followed all instructions.
470206
As a rule, this product got great reviews. Mostly 4 and 5 stars. Not mine, though. Mine came with the cover visibly warped. Top and bottom 1/4" higher than where it attaches in the center edge. Had to return it. Glad I bought from Amazon, so no return hassles. There was no Replace option, just Return. Too bad. My wife bought one of these several years ago. Came perfect, still in good shape after lots of use.
3079318
These do a pretty good job of providing a hiding place for my reptile. However, what is weird about this size is that it seems to be prone to warping slightly.  I'm not sure if its the humidity combined with the heat or what, but  two of these that I have have ended up slightly twisted.

Reptile doesn't care though :)
2357277
can't hold up to many hot fires - eventually starts warping
3167388
I bought these as a Christmas gift. I had them stored away and made the mistake of not opening them up withing the 30 day return window. 5 of 6 glasses have areas where the glass is warped. I don't think this will affect its use but they clearly have some sort of cosmetic manufacturing errors.

Update: upgraded this to OK since I do like these, despite the stupid manufaturing glitches, including some misalignment of the lip.
2064388
Update: I have reduced my rating to two stars.  Turns out with just the second use and the first use of the lid...the screw loosened on the lid.  I discovered it could not be tightened.  I had to remove the washer gizmo to allow more threads into the handle and that allowed it to tighten, but it is not what I would call a satisfactory solution.  And actually the warping is substantial, but temporary it seems.  Upon heating up the pan warps so that only the very center is touching my glass top and items in the very center cook much faster...not good.  I paid way to much for this type of performance.  If you have any other stove than a glass top this pan may be okay for you...but I would stay away if you have a glass top.

The warping was not horrendous, but enough to result in longer heat up...it is a lightweight pan...so not a surprise.  It worked well enough...but I was surprised at how quickly it went out of shape.
1084439
I went off the great reviews, despite seeing some about it being warped. I thought, surely with so many good reviews, the outliers were just using it wrong, heating it too hot, or something. Guess not. Guess some people are lucky and some aren't. Perhaps certain sizes are more flexible, or perhaps they have quality assurance issues in-house. I do most of my oven-cooking at 350-400, with maybe one 450 use. This thing is definitely warped. It's basically bowed from corner to corner, as if it's trying to curl up.

I gave it 2 stars because it's still functional and works, but when you are working with a warped sheet, it fidgets around a lot on surfaces since it won't lie flat. I don't do a lot of baking so it's not the worst thing in the world, but I'm super disappointed that they call out that this thing is thick and won't warp, but it warped almost immediately. I specifically bought this product for that, plus that it's USA made.
200092
I bought two of these. Both warped on med heat in the first couple uses. I will be doing a second return and looking elsewhere. Probably All Clad, though I was hoping that these would work out so I could save some money.

I also have the 12 piece set and the saute pan has started to warp as well
270840
The panel isn't actually flat. Seems to be warped a little bit. Still a good value for the money if you remember not to fixate on that. its not horribly obvious.
2844212
Entire unit is slightly warped. Functions perfectly though so I don't see it as a big deal. It's likely not even Mayflash's fault. Someone may have stored some of these units in a hot environment.
2455717
First time use in microwave made it warp and today I put it in the trash - don't buy it
904824
Mine seems to be warped in the middle.  From the first time using it, the center rises higher than the outer ridge.  I need to return it...has anyone else had this problem??
2891713
I've had no problems with the "warping" people mentioned. But the hardware that comes with it is sub-par. Use a stud if possible, if no stud is available, get better sheetrock anchors with longer screws. The Les Paul in the photo is a somewhat heavier guitar, and the hanger has had no problems with it. If the hardware was good, 5 stars.
2759979
Seems solidly built, but started to warp after about 6 months of mild use, of course taking care to let it cool before putting it in cold water. Pan rocks about the center on a flat cooktop and spins like a top now.