If you know how to work it, it works beautifully. If the planets don’t align just right – it’ll never work. Google Chrome would not work for me, and Firefox was touch and go. I had to use the latest Internet Explorer and reinstall the FileOpen plugin (from the official website, to get the latest version). After that, everything was peachy.
I don’t recommend using Printsew.com (I bought downloads from sewingpatterns.com), but if you like fiddling with technology, and it’s what you want, then go for it. Printsew.com only lets you use one computer to print from, and the printing allowances are very limited. You need to print the actual size, and it takes maybe 30 minutes to cut and paste the pattern together once it’s done. All in all, I think it’s worth it for SOME things, since it’s instant patterns, and I can print as many copies as I want.
As for printing, I would only recommend using a regular laser printer. Because the printing permissions are so sparse, it may be difficult to adjust for plotters, etc.
For the files themselves – they often are corrupted, damaged, etc. Printsew.com is a gamble.