I like the envelopes because they are the least expensive envelopes to get the job done. I don't need "security envelopes" to do the job so I buy the least expensive to do the job. I have been happy with the quality and the miminal "throwback" from the printer is workable. The difference between the cost of the plain envelopes and the "security envelopes" does not justify the added expense. I will continue to use these envelopes rather than pay the difference in price for the securiy ones.