I print my own greeting cards and embroider holiday cards and greeting cards that are this larger size. It is surprising how many times I reach for this particular envelope over a "kraft" type envelope.
I have to send more than 500 newsletters each month and this envelope speed up the process. It does not create any mess either since you don't need any water to wet the glue.
Worked just as I wanted - top fold envelopes frequently jam in high capacity laser printers - these do not. I ran my first mailing (about 300 envelopes) without a single jam!!