It works great to print checks from Quicken. We’ve been printing them from Quicken for many, many years. I get the wallet checks with voucher. They come three to a sheet (which is the same as a letter size sheet of paper). We get the window envelopes to match from checksforless.com.  If you prefer large checks, they have those too. The nice thing is, the payee’s address prints out in the check and shows through the window in the envelope (along with your return address). And a little voucher prints out that I staple to the invoice/statement. It takes a little experimenting to get the print aligned properly, there’s an alignment test print. I did that on a blank sheet of paper and held it up to a sheet of checks so I didn’t waste the checks.