Excellent choice for mailing half sheet or single fold documents as well as items like sets of note cards or other envelopes. Paper is a fine thickness and takes labels and stamps well. I see no reason to spend more for another product. Not having a brass clasp is a plus as well for mailing. The gummed adhesive seems to work fine although for mailing a thicker package a strip of tape across the flap is always a good idea.
I like the gummed closure rather than the clasp as it costs less to mail. The Post Office charges extra if it has a clasp because it won't run through the machine.
These envelopes are great. The best feature is that they are smaller and not subject to additional postage for a larger envelope when mailing. That was the main reason for purchasing them.