Product review (3 stars): Good product, but I'll look elsewhere next time
The amazon description for this range hood filter sold by My Filter House is:
  GE Part Number WB13X5004 FILTER 30"
but it doesn't seem to be a GE part. It has the name "All-Filters Inc." debossed/engraved on it. I wasn't expecting a genuine GE part, though, because the picture didn't look quite the same as the original part.

My range hood takes two grease filters, so I ordered two. They arrived in good condition, but they weren't made quite rectangular (one side is slightly short), and the size is a 1/16" smaller in width as well as depth than the original. The fit is good enough, though. Each filter leaves about a 1/4" gap, so I used a piece of aluminum angle bracket to cover the unsightly gaps.  Actually, the slightly undersized filter brought out the fact that the factory filter is a little undersized as well!

The filters are flimsy and see-through, but they are of almost the same quality as the factory part at about 1/5 of the price. Overall, I would say the quality is okay. I wouldn't buy these filters again because I prefer something that I wouldn't feel I need to handle gently, but I would recommend them as a good value.