Panasonic NN-SB458S Review

Though this model delivered one of the best microwave performances of the entire test suite with the frozen burrito and had one of the better popcorn presets, we wouldn't base a purchase decision on those factors alone. However, they might be something to keep in mind if you are considering this particular model.

Performance Comparison

Likes

As mentioned above, the Panasonic NN-SB458S delivered its most noteworthy performances with frozen foods — both with premade frozen foods and when defrosting frozen ground turkey. This kitchen appliance exceptionally impressed us with its performance in the burrito test, with the left, right, and center zones only showing an average temperature difference of only 3°F, with the entire burrito warmed up both above the recommended temperature and warm enough to serve in the opinion of our testers.

It did almost as well with the Hot Pocket, with the average temperature difference only increasing to around 7°F. However, the NN-SB458S lost a few points for slightly burning one end, getting it a little crustier than we would have liked.

The Panasonic NN-SB458S continued its strong showing into the defrosting test. This microwave completely defrosted 8.75 ounces of the one-pound block, and the remaining part very easily broke apart — enough that we would have felt fine to toss everything right into the pan. It had an alert to let us know when it was time to flip the turkey a few minutes into the process, and we appreciated that it didn't cook any of the meat prematurely.

The NN-SB458S performed a bit better than average in some of our heating tests. It heated the 125 mL of water very quickly, raising its temperature to almost 90°F after 45 seconds of heating. It also did exceptionally well with our plate of leftovers using its auto-reheat function. The sausage, potatoes, and green beans weren't too far apart in temperature, and all three were warm enough to eat without additional time in the microwave, something we couldn't say about every model.

The Panasonic NN-SB458S also did an above-average job at reheating the canned soup, getting it more than warm enough when we followed the heating instructions.

Dislikes

The Panasonic NN-SB458S delivered some relatively poor results when it came to reheating pizza. The two slices were heated very unevenly, with one slice being far from hot enough to eat and the other exhibiting significant temperature discrepancies.

We weren't amazingly impressed with this appliance's performance in our heat map tests. Some areas were completely burnt, while others were still browning.

The NN-SB458S also disappointed us somewhat with its performance at heating the individual miniature lasagna. Overall, it wasn't heated quite enough, and there were substantial temperature discrepancies between the six points we measured — one as large as 52°F.

We also found this product to be a little less user-friendly compared to some of the competition. The +30 seconds button doesn't automatically start the appliance, and it lacks any one-touch features. Its internal light isn't terribly bright, and we found that the unit easily slides around when you push a button or open/close the door if it's on any sort of slick countertop.

Should You Buy the Panasonic NN-SB458S?

The Panasonic NN-SB458S provides a decent value as a garden variety microwave offered at a reasonable price. It has a few noteworthy performances (it was stellar with leftovers, although not with leftover pizza), but overall we'd point you in the direction of one of the other better options in the group.

What Other Microwaves Should You Consider?

For a top-of-the-line product that performs well, we'd point just about anyone towards the Toshiba EM131A5C. Anyone intending on mainly cooking frozen foods in their microwave can't go wrong with the Panasonic NN-SN67KS.