I too have been using this product for years. It saves me a lot of time each month when I do a batch of bills. The only problem I have is when I use them in the printer to put on the return address they stick together. I have to make sure each is separated before putting them into the sheet feeder. Otherwise they are just fine
I have been using these envelopes for a while. They are good quality. and reasonably priced. I prefer them to the type with the pull off over the glue strip.
I have used the traditional envelopes that you seal with a glue stick for 16 years this year I purchased these self-sticking envelopes in error. But now that I have gone through 2 boxes of 500 envelopes I will not go back to the envelopes I used before I am very busy so time is of the essence for me. I do not have to buy messy glue sticks anymore also when I would seal the envelope with the glue sticks sometimes the invoices I was mailing would stick to the envelope and made it a little difficult taking them out of the envelope.
The envelopes seem fine except when running them through our printer to add our logo & return address the "window" gets crinkeled & distorted from the heat.