An important thing to consider is whether the saw cuts on the "push" stroke or the "pull" stroke. Owing to the thin blade, any PE saw will be much more prone to bending if the blade cuts on the "push" stroke.
If, when shopping, the product has a close-up image, see which way the teeth slant. If they slant away from the handle-end, it's a "push" stroke and you'll probably be disappointed.
As a last resort, trim a "push" blade to allow it to be reversed in the handle, thus making it a "pull" blade.